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Baby sizing, brand by brand · Little & Youth

What size is Preemie & Newborn?How a Preemie & Newborn compares across 39 baby brands — by weight

A Preemie & Newborn isn't the same everywhere. Baby sizes are set mostly by weight, and each brand draws its Preemie & Newborn a little differently. Here is every brand on Little & Youth that sells a Preemie & Newborn, then the brands that call the same weight something else.

The short answer: At the 39 brands on Little & Youth that sell a size called Preemie & Newborn, it fits a baby of up to about 8 lb, roughly 18–21 in long — the middle of those brands' own published ranges. Baby sizes are set mostly by weight, then length, so weigh before you buy. Across those brands the same Preemie & Newborn spans 4.9–10 lb. 3 more brands sell a size with a different name whose own published weight overlaps this range; they're listed separately, exactly as each brand prints them.

Brands that sell a size called Preemie & Newborn

Each brand's own published weight and length for its Preemie & Newborn, lightest to heaviest. Expand "source" for the chart each row comes from.

Preemie & Newborn across 39 brands — weight (lb) and length (in), as each brand publishes them.
BrandTheir sizeWeightLength
Little SleepiesMicro Preemieup to 3 lbup to 15 in
source
Source: https://littlesleepies.com/pages/sizing-guide · Captured: 2026-10-07
JoJo Maman BébéPremature4.9 lb18.9 in
source
Chart: Baby 0 - 24 Months · Source: https://www.jojomamanbebe.com/us/en/sizing-and-care-guide/baby-and-childrens-size-guide · Captured: 2026-09-04
Amazon Essentials KidsP (Preemie)up to 5 lbup to 17 in
source
Source: https://z-ecx.images-amazon.com/images/G/01/apparel/en_US/html/sizechart/kids._V201566742_.html · Captured: 2026-09-20
Carter'sUp to 5lbup to 5 lbup to 17 in
source
Chart: Bodysuits · Source: https://www.carters.com/size-chart · Captured: 2026-10-07
Gerber ChildrenswearPreemieup to 5 lbup to 17 in
source
Chart: Preemie to Toddler · Source: https://www.gerberchildrenswear.com/pages/size-chart-gerber-childrenswear · Captured: 2026-09-04
HatleyUp to 5lbsup to 5 lbup to 17 in
source
Chart: Baby · Source: https://us.hatley.com/pages/size-chart · Captured: 2026-10-05
Janie and JackPreemie/Up to 5 lbsup to 5 lbup to 17 in
source
Chart: Baby - Clothing · Source: https://www.janieandjack.com/janieandjack-size-charts.html?lang=en_US · Captured: 2026-09-04
Little Planet by Carter'sUp to 5lbup to 5 lbup to 17 in
source
Chart: Bodysuits · Source: https://www.carters.com/size-chart · Captured: 2026-10-07
Little SleepiesPreemieup to 5 lbup to 18 in
source
Source: https://littlesleepies.com/pages/sizing-guide · Captured: 2026-10-07
Magnetic MePRE (preemie)up to 5 lbup to 18 in
source
Chart: Baby · Source: https://www.magneticme.com/pages/size-chart · Captured: 2026-09-04
Monica + AndyPreemieup to 5 lbup to 17 in
source
Chart: Baby Sizes · Source: https://monicaandandy.com/products/oversized-slouchy-tee · Captured: 2026-10-05
OshKosh B'goshUp to 5lbup to 5 lbup to 17 in
source
Chart: Bodysuits · Source: https://www.carters.com/size-chart · Captured: 2026-10-07
Walmart Wonder NationPreemieup to 5 lbup to 17 in
source
Source: https://www.walmart.com/ip/Wonder-Nation-Boys-Kid-Tough-T-Shirt-Sizes-XS-XXL-and-Husky/938545778 · Captured: 2026-09-20
Cloud IslandPreemieup to 5.5 lbup to 17.5 in
source
Chart: Baby · Source: https://digitalcontent.target.com/itemcontent/sizecharts/htmlfragments/baby-toddler-clothing/cloud-island/regular.html · Captured: 2026-10-05
Target Cat & JackPreemieup to 5.5 lbup to 17.5 in
source
Chart: Baby · Source: https://digitalcontent.target.com/itemcontent/sizecharts/htmlfragments/baby-toddler-clothing/cat-jack/regular.html · Captured: 2026-09-20
Burt's Bees BabyPreemieup to 6 lbup to 17 in
source
Chart: Baby/Toddler/Kids · Source: https://www.burtsbeesbaby.com/pages/baby-clothes-size-chart · Captured: 2026-09-04
Carter'sPreemieup to 6 lbup to 18 in
source
Chart: Pajamas (general body ladder) · Source: https://www.carters.com/size-chart · Captured: 2026-10-07
Hudson BabyPreemie6 lb18 in
source
Chart: Baby Clothing · Source: https://hudsonchildrenswear.com/pages/sizechart.html · Captured: 2026-10-05
Little Planet by Carter'sPreemieup to 6 lbup to 18 in
source
Chart: Pajamas (general body ladder) · Source: https://www.carters.com/size-chart · Captured: 2026-10-07
OshKosh B'goshPreemieup to 6 lbup to 18 in
source
Chart: Pajamas (general body ladder) · Source: https://www.carters.com/size-chart · Captured: 2026-10-07
babyGapUP TO 7 LBSup to 7 lbup to 18 in
source
Chart: BABY SIZE CHART · Source: https://www.gap.com/customer-service/size-charts?cid=2105 · Captured: 2026-09-04
GymboreeUp to 7 lbsup to 7 lbup to 17.5 in
source
Chart: Baby · Source: https://www.gymboree.com/us/content/size-chart · Captured: 2026-10-07
HatleyUp to 7lbsup to 7 lbup to 18 in
source
Chart: Baby · Source: https://us.hatley.com/pages/size-chart · Captured: 2026-10-05
J.Crew CrewcutsNBup to 7 lbup to 20.5 in
source
Chart: Baby (Height/Weight/Waist/Chest; no metric table published) · Source: https://www.jcrew.com/r/size-charts · Captured: 2026-09-04
Kyte BabyPreemieup to 7 lbup to 19 in
source
Chart: Infant & Toddler apparel (weight+height) · Source: https://kytebaby.com/pages/sizing-chart · Captured: 2026-09-30
Old NavyUp to 7 lbsup to 7 lbup to 21.5 in
source
Chart: Baby · Source: https://oldnavy.gap.com/browse/product.do?pid=614457002 · Captured: 2026-09-20
Patagonia KidsNewbornup to 7 lbup to 20 in
source
Chart: Infants & Toddlers Size Chart · Source: https://www.patagonia.com/size-unisex-infant-data.html?format=ajax · Captured: 2026-09-04
The Children's PlaceUp to 7lbsup to 7 lbup to 17.5 in
source
Source: https://www.childrensplace.com/us/content/size-chart · Captured: 2026-10-07
Marks & SpencerNewborn7.1 lb19.69 in
source
Chart: Baby · Source: https://www.marksandspencer.com/us/sizeguides/sizeguidekids/sizeguidekids-baby.html · Captured: 2026-09-09
GaranimalsNB5.5–7.5 lb17.5–21 in
source
Source: https://www.garanimals.com/size-chart · Captured: 2026-09-04
Primark KidsNewborn7.5 lb17.32–19.69 in
source
Chart: Baby Clothes: Newborn - 36 Months (product-page Size Guide) · Source: https://www.primark.com/en-us/p/0-18mths-disney-pixars-toy-story-newborn-romper-ivory-991181820006 · Captured: 2026-10-07
Walmart Wonder NationNewborn5.5–7.5 lb17.5–21 in
source
Source: https://www.walmart.com/ip/Wonder-Nation-Boys-Kid-Tough-T-Shirt-Sizes-XS-XXL-and-Husky/938545778 · Captured: 2026-09-20
Amazon Essentials KidsNB (Newborn)5–8 lbup to 20 in
source
Source: https://z-ecx.images-amazon.com/images/G/01/apparel/en_US/html/sizechart/kids._V201566742_.html · Captured: 2026-09-20
BoxLunchNewborn5–8 lb17–21 in
source
Chart: Infant/Baby · Source: https://www.boxlunch.com/customer-service/merchandise/size-fit-guide/ · Captured: 2026-09-04
Gerber ChildrenswearNewborn (NB)5–8 lb17–21 in
source
Chart: Preemie to Toddler · Source: https://www.gerberchildrenswear.com/pages/size-chart-gerber-childrenswear · Captured: 2026-09-04
Hanna AnderssonNewbornup to 8 lbup to 19 in
source
Chart: Baby & Toddler · Source: https://www.hannaandersson.com/kids-size-chart.html · Captured: 2026-09-04
Janie and JackNewborn5–8 lb17–18 in
source
Chart: Baby - Clothing · Source: https://www.janieandjack.com/janieandjack-size-charts.html?lang=en_US · Captured: 2026-09-04
Little SleepiesNewborn5–8 lb18–21 in
source
Source: https://littlesleepies.com/pages/sizing-guide · Captured: 2026-10-07
Macy's First ImpressionsNewbornup to 8 lbup to 21 in
source
Chart: Baby · Source: https://www.macys.com/xapi/digital/v1/product/21640640/sizechart/267301644?clientId=PROS · Captured: 2026-09-20
Magnetic MeNB (newborn)5–8 lbup to 21 in
source
Chart: Baby · Source: https://www.magneticme.com/pages/size-chart · Captured: 2026-09-04
Quincy Maenb6–8 lb18–20 in
source
Chart: Quincy Mae — Body · Source: https://ryleecru.customerdesk.io/#rp-customer-widget-faq-ebe725ad-f773-4634-bbd6-0c8dd0af7e18 · Captured: 2026-09-13
Target Cat & JackNewborn6–8 lb18–20 in
source
Chart: Baby · Source: https://digitalcontent.target.com/itemcontent/sizecharts/htmlfragments/baby-toddler-clothing/cat-jack/regular.html · Captured: 2026-09-20
Tea CollectionNB5–8 lb17–20 in
source
Chart: Newborn Nb To 6-12m · Source: https://teacollection.com/pages/size-chart · Captured: 2026-09-09
Cloud IslandNewborn6–8.5 lb18–20 in
source
Chart: Baby · Source: https://digitalcontent.target.com/itemcontent/sizecharts/htmlfragments/baby-toddler-clothing/cloud-island/regular.html · Captured: 2026-10-05
Burt's Bees BabyNewborn6–9 lbup to 21.5 in
source
Chart: Baby/Toddler/Kids · Source: https://www.burtsbeesbaby.com/pages/baby-clothes-size-chart · Captured: 2026-09-04
Carter'sNewborn6–9 lb18–21.5 in
source
Chart: Pajamas (general body ladder) · Source: https://www.carters.com/size-chart · Captured: 2026-10-07
Outerwear chart, same size: 6–7 lb, 18.5–21 in
Hudson BabyNewborn6–9 lb18–21.5 in
source
Chart: Baby Clothing · Source: https://hudsonchildrenswear.com/pages/sizechart.html · Captured: 2026-10-05
Kyte BabyNewborn6–9 lb18–21 in
source
Chart: Infant & Toddler apparel (weight+height) · Source: https://kytebaby.com/pages/sizing-chart · Captured: 2026-09-30
Little Planet by Carter'sNewborn6–9 lb18–21.5 in
source
Chart: Pajamas (general body ladder) · Source: https://www.carters.com/size-chart · Captured: 2026-10-07
Outerwear chart, same size: 6–7 lb, 18.5–21 in
Monica + AndyNewborn5–9 lbup to 20 in
source
Chart: Baby Sizes · Source: https://monicaandandy.com/products/oversized-slouchy-tee · Captured: 2026-10-05
OshKosh B'goshNewborn6–9 lb18–21.5 in
source
Chart: Pajamas (general body ladder) · Source: https://www.carters.com/size-chart · Captured: 2026-10-07
Outerwear chart, same size: 6–7 lb, 18.5–21 in
PrimaryNB5–9 lbup to 18 in
source
Chart: All Baby Clothing (rows 2 and 3 omitted - see notes.md) · Source: https://size-chart-server.primary.codes/all-baby-clothing · Captured: 2026-09-09
abercrombie kidsNB5.5–9.5 lb17–22 in
source
Chart: Baby & Toddler · Source: https://www.abercrombie.com/shop/us/kids/p/straight-jeans-56562026 · Captured: 2026-09-04
JoJo Maman BébéNewborn9.9 lb22.05 in
source
Chart: Baby 0 - 24 Months · Source: https://www.jojomamanbebe.com/us/en/sizing-and-care-guide/baby-and-childrens-size-guide · Captured: 2026-09-04
Joules KidsNewborn Up to 1mup to 9.9 lb22 in
source
Chart: BABY & TODDLER · Source: https://joulesuk.zendesk.com/hc/en-gb/articles/30459306847505-Size-Guides · Captured: 2026-09-04
GymboreeNB7–10 lb17.5–20.5 in
source
Chart: Baby · Source: https://www.gymboree.com/us/content/size-chart · Captured: 2026-10-07
Mini BodenNewbornup to 10 lbup to 22 in
source
Chart: GIRLS & BOYS BODY MEASUREMENTS · Source: https://global.boden.com/pages/childrens-size-and-fit-chart · Captured: 2026-09-04
Polo Ralph Lauren KidsNBup to 10 lbup to 21 in
source
Chart: Baby Size Guide - Apparel · Source: https://www.ralphlauren.com/baby-size-guide/baby_all_ages_apparel.html · Captured: 2026-09-09
The Children's PlaceNewborn7–10 lb17.5–20.5 in
source
Source: https://www.childrensplace.com/us/content/size-chart · Captured: 2026-10-07
BonpointNewborn—up to 20.5 in
source
Chart: Baby · Source: https://us.bonpoint.com/blogs/size-guide/baby · Captured: 2026-09-04
H&M KidsNewborn—22.05 in
source
Chart: Kids 0-4 years (unisex, as H&M publishes it) · Source: https://www2.hm.com/en_us/productpage.1314910008.html · Captured: 2026-09-20
Kohl's Jumping BeansNewborn—19–22 in
source
Chart: Baby · Source: https://www.kohls.com/media/digital/ecom/size-charts/childrens/html/KohlsJumpingBeansLittleCoBoysApparelSizeChart.html · Captured: 2026-09-04

Same weight, different label

These brands don't sell a size called Preemie & Newborn. Each row is one of the brand's own sizes whose published weight overlaps up to 8 lb — shown with the brand's label, weight and length as printed. Labels are the brands' own; we don't treat them as the same size as Preemie & Newborn.

Other baby sizes whose own published weight overlaps the Preemie & Newborn weight band.
BrandTheir sizeWeightLength
Jacadi0M6–8 lb19.7 in
source
Chart: Baby · Source: https://www.jacadi.us/size-chart · Captured: 2026-09-20
Converse Kids0 Months6–9.5 lb20–22 in
source
Chart: Infant & Toddler Apparel · Source: https://www.converse.com/size-chart-guide?id=infantandtoddler-tops&modal=false · Captured: 2026-09-09
Jacadi1M6–10 lb21 in
source
Chart: Baby · Source: https://www.jacadi.us/size-chart · Captured: 2026-09-20
Guess0/3Mup to 12 lbup to 23.5 in
source
Source: https://content.guess.com/GuessUS/Frontend/sizechart/kids_sizecharts.html · Captured: 2026-09-04

Weight, length and the diaper

Two babies of the same age can be two sizes apart, which is why the age on the tag is the weakest guide. Go by weight first, then length. Bodysuits and footed sleepers also have to close over a diaper: if your baby is near the top of a brand's range, is long for their weight, or wears cloth diapers, the next size up usually snaps more easily.

Common questions about preemie and newborn sizes

What weight is a Preemie & Newborn for?

At the 39 brands on Little & Youth that sell a Preemie & Newborn, it fits a baby of up to about 8 lb — the middle of their own published ranges. Brands vary: the same Preemie & Newborn spans 4.9–10 lb across them, so check the brand's own weight range.

Is a Preemie & Newborn the same at every brand?

No. Baby sizes aren't standardized — across the brands here a Preemie & Newborn covers 4.9–10 lb, and some brands name the same weight differently (a single age like 6M, months like 6 mos, or a centimetre size). Weigh and measure your baby and compare against each brand's own chart.

Know your baby's size at every brand. Let Little & Youth do it.

Enter your baby's weight and length once and Little & Youth shows the size to buy across the brands on the site — each from that brand's own published chart.

Find your child's size →
Their Measurements. Right Size. Brand by Brand.
How we know this is accurate. Every weight and length on this page is transcribed from that brand's own published baby size chart — no estimates and no averaged-out "standard". Where a brand prints only an upper limit ("up to 7 lb"), that is how it is shown. Brands update their charts, so confirm against the brand's live chart before you buy. Little & Youth is independent and not affiliated with any brand listed. Figures verified 2026-10-08.