Do I need a snowsuit for my newborn? When it helps, and the car seat rule
In shortOnly if your baby will go out on freezing days. Cotokim's list adds a snowsuit or bunting in size 3M for the months when the average low is below freezing: for a baby born on January 15, 2027, that is 1 in Chicago and 0 in Houston. In the car seat it comes off: bulky clothing can prevent a snug harness fit, so buckle your baby in thin layers and put a coat or blanket over the harness.
A snowsuit or a bunting is a warm one-piece, or a bag, for going out when it is freezing. Whether your newborn needs one depends on the weeks your baby will spend in each size and on your city's winter, which Cotokim reads from NOAA's climate normals 1. This is what the list says for a baby born on January 15, 2027 in Chicago:
1 snowsuit or bunting: for going out on freezing days; your baby will wear size 3M · 0 to 3 months between January and March in Chicago. Take it off before buckling the car seat and when you get home.
71 items on the list for the birth and the first 6 months, with 1,432 diapers, for the weather in New York City.
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The first 6 months in New York City
- Feb36°F2.2 °CcoldNB
- Mar43°F6.0 °CcoldNB and 3M
- Apr54°F12.1 °Ccold3M
- May63°F17.3 °Ccold3M and 6M
- Jun72°F22.2 °Cmild6M
- Jul78°F25.3 °Chot6M
- Aug76°F24.5 °Chot6M and 9M
The first and last months count only the days that fall within the first 6 months. Typical weather: NOAA U.S. Climate Normals (1991-2020), station NEW YORK CNTRL PK TWR, NY US, 5 mi (8 km) away.
Tap a phase to see the items, the amounts and the reason behind each number. The amounts are a Cotokim proposal.
Phase 1: Ready for the birth
44 items
Clothes
2Short-sleeve bodysuitNBWhy?
2 short-sleeve bodysuits: your baby will wear size NB · newborn between February and March, with cold weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
2Long-sleeve bodysuitNBWhy?
2 long-sleeve bodysuits: your baby will wear size NB · newborn between February and March, with cold weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
2Sleeper or footie (long sleeves and legs)NBWhy?
2 sleepers: your baby will wear size NB · newborn between February and March, with cold weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
1Short-sleeve romperNBWhy?
1 short-sleeve romper: your baby will wear size NB · newborn between February and March, with cold weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
2Footed or pull-on pantsNBWhy?
2 pairs of pants: your baby will wear size NB · newborn between February and March, with cold weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
3Cardigan or light jacketNBWhy?
3 cardigans or light jackets: your baby will wear size NB · newborn between February and March, with cold weather in New York City.
3SocksNBWhy?
3 pairs of socks: your baby will wear size NB · newborn between February and March, with cold weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
2Scratch mittens (optional)NBWhy?
2 pairs of scratch mittens: optional, for the first weeks. Short, filed nails are the alternative.
2Knit hat (for going out in the cold)NBWhy?
2 knit hats: for going out on cold days; your baby will wear size NB · newborn between February and March, with cold weather in New York City.
1Snowsuit or bunting (for going out in freezing weather)3MWhy?
1 snowsuit or bunting: for going out on freezing days; your baby will wear size 3M · 0 to 3 months between February and May in New York City. Take it off before buckling the car seat and when you get home.
Sleep
1CribWhy?
1 crib: a sleep space just for your baby, with a firm mattress and only a fitted sheet inside.
1Crib mattressWhy?
1 crib mattress: firm and flat, covered only by a fitted sheet.
3Fitted crib sheetWhy?
3 fitted crib sheets: one on the mattress, one in the wash and spares for nights when the diaper leaks; you do laundry every two days.
2Waterproof mattress coverWhy?
2 waterproof mattress covers: one on the mattress and one in the wash.
2Wearable blanket (sleep sack)Why?
2 wearable blankets: keeps your baby warm without a blanket in the crib; with cold (February, March, April, and May), mild (June), and hot (July and August) weather in New York City in the first months, choose the TOG by your room temperature. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
3Swaddle (blanket or wearable)Why?
3 swaddles: for the first weeks, until your baby tries to roll; you do laundry every two days.
3Baby blanket (for holding and outings)Why?
3 baby blankets: for holding and outings, with cold (February, March, April, and May), mild (June), and hot (July and August) weather in New York City in the first months.
Bath and hygiene
1Baby bathtubWhy?
1 baby bathtub: one per home is enough, even with twins (one bath at a time).
2Hooded towelWhy?
2 hooded towels: one in use, one in the wash and one spare; you do laundry every two days.
1Mild baby washWhy?
1 bottle of baby wash: a bottle lasts weeks at first; buy more when you open the last one.
1Baby nail file and clippers (or rounded scissors)Why?
1 nail care kit: one per home is enough.
1Cotton balls or pads (optional)Why?
1 pack of cotton balls: optional; buy more as you go.
Diapering
348Disposable diapersNWhy?
348 size N diapers (about 3 packs): your baby will likely wear this size for about 5 weeks, with 8 to 12 changes a day.
3Fragrance-free baby wipesWhy?
3 packs of wipes: for the first weeks; Pampers says newborns may need about 20 to 30 wipes a day, so buy more as you go.
1Diaper rash barrier creamWhy?
1 tube of diaper cream: a tube lasts weeks at first; buy more when it runs low.
1Portable changing padWhy?
1 portable changing pad: it stays in the diaper bag.
1Changing pad (for a dresser)Why?
1 changing pad: saves your back at changing time.
Out and about
1Infant car seat (rear-facing)Why?
1 infant car seat: your baby should ride rear-facing from the first ride home from the hospital.
1Diaper bagWhy?
1 diaper bag: goes on every outing; it can be the hospital bag too.
1Mosquito net for stroller and carrier (optional)Why?
1 mosquito net: optional, for mosquito season in the first months, with cold (February, March, April, and May), mild (June), and hot (July and August) weather in New York City.
Feeding
7Burp clothWhy?
7 burp cloths: three or four a day go in the wash; you do laundry every two days.
1Nursing pillow (optional)Why?
1 nursing pillow: optional, for mom's comfort; it stays out of the crib.
Nursery
1Room thermometerWhy?
1 room thermometer: sleepwear and the sleep sack's TOG are chosen by the room temperature.
1Dim night lightWhy?
1 night light: for night feeds, without turning on the bright light.
1Laundry hamperWhy?
1 laundry hamper: helps you keep your laundry routine.
Health
1Digital thermometerWhy?
1 digital thermometer: one per home, instead of a mercury thermometer.
1Saline nose dropsWhy?
1 bottle of saline drops: to have at home; use as your baby's doctor advises.
Hospital bag
1Coming-home outfitWhy?
1 coming-home outfit: the outfit for the ride home, planned for the weather of the birth month in New York City.
1Hospital bagWhy?
1 hospital bag: it can be the diaper bag, if everything fits.
For mom
2Nursing braWhy?
2 nursing bras: one on, one in the wash and one spare; you do laundry every two days.
1Nursing padsWhy?
1 box of nursing pads: for the first weeks; not every mom needs them.
3Postpartum padsWhy?
3 packs of postpartum pads: for the hospital and the first weeks at home.
4High-waist cotton underwearWhy?
4 pairs of underwear: two a day in the first weeks; you do laundry every two days.
2Nursing nightgown or pajamasWhy?
2 nursing nightgowns or pajamas: for the hospital and nights at home; you do laundry every two days.
Phase 2: Up to 6 months
27 items
Clothes
3Short-sleeve bodysuit3MWhy?
3 short-sleeve bodysuits: your baby will wear size 3M · 0 to 3 months between March and May, with cold weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
3Short-sleeve bodysuit6MWhy?
3 short-sleeve bodysuits: your baby will wear size 6M · 3 to 6 months between May and August, with cold (May), mild (June), and hot (July and August) weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
3Long-sleeve bodysuit3MWhy?
3 long-sleeve bodysuits: your baby will wear size 3M · 0 to 3 months between March and May, with cold weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
2Long-sleeve bodysuit6MWhy?
2 long-sleeve bodysuits: your baby will wear size 6M · 3 to 6 months between May and August, with cold (May), mild (June), and hot (July and August) weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
3Sleeper or footie (long sleeves and legs)3MWhy?
3 sleepers: your baby will wear size 3M · 0 to 3 months between March and May, with cold weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
2Sleeper or footie (long sleeves and legs)6MWhy?
2 sleepers: your baby will wear size 6M · 3 to 6 months between May and August, with cold (May), mild (June), and hot (July and August) weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
2Short-sleeve romper3MWhy?
2 short-sleeve rompers: your baby will wear size 3M · 0 to 3 months between March and May, with cold weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
3Short-sleeve romper6MWhy?
3 short-sleeve rompers: your baby will wear size 6M · 3 to 6 months between May and August, with cold (May), mild (June), and hot (July and August) weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
1Fleece or plush sleeper3MWhy?
1 fleece sleeper: your baby will wear size 3M · 0 to 3 months between March and May, with cold weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
1Fleece or plush sleeper6MWhy?
1 fleece sleeper: your baby will wear size 6M · 3 to 6 months between May and August, with cold (May), mild (June), and hot (July and August) weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
2Footed or pull-on pants3MWhy?
2 pairs of pants: your baby will wear size 3M · 0 to 3 months between March and May, with cold weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
2Footed or pull-on pants6MWhy?
2 pairs of pants: your baby will wear size 6M · 3 to 6 months between May and August, with cold (May), mild (June), and hot (July and August) weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
3Cardigan or light jacket3MWhy?
3 cardigans or light jackets: your baby will wear size 3M · 0 to 3 months between March and May, with cold weather in New York City.
2Cardigan or light jacket6MWhy?
2 cardigans or light jackets: your baby will wear size 6M · 3 to 6 months between May and August, with cold (May), mild (June), and hot (July and August) weather in New York City.
3Socks3MWhy?
3 pairs of socks: your baby will wear size 3M · 0 to 3 months between March and May, with cold weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
3Socks6MWhy?
3 pairs of socks: your baby will wear size 6M · 3 to 6 months between May and August, with cold (May), mild (June), and hot (July and August) weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
1Scratch mittens (optional)3MWhy?
1 pair of scratch mittens: optional, for the first weeks. Short, filed nails are the alternative.
2Knit hat (for going out in the cold)3MWhy?
2 knit hats: for going out on cold days; your baby will wear size 3M · 0 to 3 months between March and May, with cold weather in New York City.
1Knit hat (for going out in the cold)6MWhy?
1 knit hat: for going out on cold days; your baby will wear size 6M · 3 to 6 months between May and August, with cold (May), mild (June), and hot (July and August) weather in New York City.
1Sun hat (optional)6MWhy?
1 sun hat: optional, for walks in the shade in the hot months.
Bath and hygiene
1Soft baby hairbrush (optional)Why?
1 soft hairbrush: optional.
Diapering
530Disposable diapers1Why?
530 size 1 diapers (about 4 packs): your baby will likely wear this size for about 10 weeks, with 6 to 10 changes a day.
554Disposable diapers2Why?
554 size 2 diapers (about 5 packs): your baby will likely wear this size for about 11 weeks, with 5 to 9 changes a day.
Out and about
1StrollerWhy?
1 stroller: for walks; in the essential list it is optional, because holding and a carrier also work.
Feeding
2Drool bibWhy?
2 drool bibs: for the drooling phase; you do laundry every two days.
Nursery
1Dresser (optional)Why?
1 dresser: optional; a closet you already have also works.
Health
1Oral syringe (no needle)Why?
1 oral syringe: to measure liquid medicine exactly, when prescribed.
Later
14 items
Clothes
3Short-sleeve bodysuit9MWhy?
3 short-sleeve bodysuits: your baby will wear size 9M · 6 to 9 months between August and December, with hot (August), mild (September), and cold (October, November, and December) weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
2Long-sleeve bodysuit9MWhy?
2 long-sleeve bodysuits: your baby will wear size 9M · 6 to 9 months between August and December, with hot (August), mild (September), and cold (October, November, and December) weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
2Sleeper or footie (long sleeves and legs)9MWhy?
2 sleepers: your baby will wear size 9M · 6 to 9 months between August and December, with hot (August), mild (September), and cold (October, November, and December) weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
2Short-sleeve romper9MWhy?
2 short-sleeve rompers: your baby will wear size 9M · 6 to 9 months between August and December, with hot (August), mild (September), and cold (October, November, and December) weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
1Fleece or plush sleeper9MWhy?
1 fleece sleeper: your baby will wear size 9M · 6 to 9 months between August and December, with hot (August), mild (September), and cold (October, November, and December) weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
3Footed or pull-on pants9MWhy?
3 pairs of pants: your baby will wear size 9M · 6 to 9 months between August and December, with hot (August), mild (September), and cold (October, November, and December) weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
3Cardigan or light jacket9MWhy?
3 cardigans or light jackets: your baby will wear size 9M · 6 to 9 months between August and December, with hot (August), mild (September), and cold (October, November, and December) weather in New York City.
3Socks9MWhy?
3 pairs of socks: your baby will wear size 9M · 6 to 9 months between August and December, with hot (August), mild (September), and cold (October, November, and December) weather in New York City, and you do laundry every two days. Your home is heated in winter, so cold months count as mild for clothes worn indoors.
2Knit hat (for going out in the cold)9MWhy?
2 knit hats: for going out on cold days; your baby will wear size 9M · 6 to 9 months between August and December, with hot (August), mild (September), and cold (October, November, and December) weather in New York City.
1Sun hat (optional)9MWhy?
1 sun hat: optional, for walks in the shade in the hot months.
Feeding
1High chairWhy?
1 high chair: for starting solids.
1Baby plate, spoon and cup (optional)Why?
1 plate, spoon and cup set: optional; your own dishes work if the spoon fits your baby's mouth.
2Feeding bibWhy?
2 feeding bibs: one per meal of the day, plus one in the wash.
Nursery
1Outlet covers and cabinet latchesWhy?
1 childproofing kit: before your baby starts to move around.
When the list adds one
A baby born on January 15, 2027, balanced amounts:
| City | Snowsuit in size NB | Snowsuit in size 3M |
|---|---|---|
| Chicago | 0 | 1 |
| New York City | 0 | 1 |
| Houston | 0 | 0 |
| Miami | 0 | 0 |
The rules behind the table, all Cotokim proposals:
- Only for freezing months. The list adds a snowsuit or bunting for the months your baby will go out when the average low of the month is below freezing. A cold month that does not freeze gets cardigans and a knit hat instead.
- Size 3M, also for the newborn weeks. On Cotokim's list the snowsuit starts at size 3M, roomier because it goes over the clothes, so a baby who meets freezing weather in size NB gets the 3M one.
- One per size. How often you do laundry does not change it: one is enough for each size that meets freezing months.
Each city page shows its freezing months, and the winter essentials show what else changes in the cold.
The car seat rule
- Nothing bulky under the harness. NHTSA says bulky clothing or blankets can prevent a snug harness fit: buckle your baby in the seat first, and then place coats or blankets over the harness 2. So the snowsuit comes off before you buckle the car seat.
- Thin, warm layers instead. When your baby will ride in a car seat, pick thin, warm layers, and add the blanket or coat after the harness is snug 3.
- Rear-facing. A child under age 1 should always ride in a rear-facing car seat 4, and NHTSA says to keep your child rear-facing as long as possible 4.
- The car seat is not a bed. If your baby falls asleep in the car seat or another sitting device, move your baby to their regular sleep space as soon as possible once you are out of the vehicle 5.
The American Academy of Pediatrics gives the same advice about snowsuits and bulky coats under the harness in its winter car seat tips.
Frequently asked questions
What size snowsuit for a newborn?
Size 3M, on Cotokim's list: it goes over the clothes and covers the newborn weeks too.
Snowsuit or bunting?
Either one does the job on the list: a one-piece with legs, or a bag. Both come off before the car seat harness goes on 2.
Can my baby sleep in a snowsuit?
No. Take it off indoors and dress your baby for the room 5. If your baby falls asleep on the way, move them to their own sleep space once you are out of the vehicle 5.
How do I keep my baby warm on the ride home from the hospital?
Thin, warm layers under the harness, and a blanket or coat over it once the harness is snug 3. Cotokim's list counts a coming-home outfit for the weather of the birth month.
Data sources
Climate normals: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020 1. Our use of material from NOAA, including links to its website, does not imply endorsement by NOAA or the U.S. Government of Cotokim or its service.
Source credits
Courtesy: Eunice Kennedy Shriver National Institute of Child Health and Human Development. Safe to Sleep® is a registered trademark of the U.S. Department of Health and Human Services.
We link to pages of the National Highway Traffic Safety Administration (NHTSA) in our own words; this does not mean that the NHTSA endorses Cotokim.
Written by the Cotokim teamChecked by the Cotokim team against the sources on this page, on October 14, 2026
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991-2020). Read on October 13, 2026.
- National Highway Traffic Safety Administration (NHTSA), How to Install Rear-Facing Car Seats. Read on October 14, 2026.
- National Highway Traffic Safety Administration (NHTSA), Winter Weather Driving Tips: Prepare Your Vehicle. Read on October 14, 2026.
- National Highway Traffic Safety Administration (NHTSA), Car Seats and Booster Seats. Read on October 14, 2026.
- Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), NIH, Ways to Reduce Baby's Risk (Safe to Sleep). Read on October 14, 2026.