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Preemie Clothes Guide: Sizes and Tips | Carter's Blog
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A Buyer’s Guide to Preemie Clothes

Our full line of preemie baby clothes (including micro preemie clothing sizes) was designed in partnership with NICU nurses with the utmost attention to detail, giving new parents one less thing to think about as they focus on getting baby healthy, strong and ready to go home.

Updated February 28, 2025

Preemie clothes

Welcoming a new baby into the world is an indescribable feeling. But for parents of preemie babies — who will spend their first days, weeks or even months in the Neonatal Intensive Care Unit (NICU) — it can also be an overwhelming time. We’re here to help with our full line of preemie baby clothes (including micro preemie clothing sizes), designed in partnership with NICU nurses to dress the tiniest (but mightiest!) bundles of joy in the softest fabrics with functional design details. Check out our guide to what to consider when buying for your newborn baby. 

1. Be aware of how sizing works

There are general sizing guidelines for infant preemie clothes, but just as with children’s and adult clothing, sizing for newborn and preemie clothes varies from one brand to the next. In addition to our standard newborn size up to nine pounds and preemie size up to 6 pounds, Carter’s® NICU preemie collection offers a preemie size up to 5 pounds. You won’t see a size range on Carter’s labels. Our clothing labeled 3M might compare to the 0-3M in another brand.

Here’s a sample of our baby apparel sizing chart: 

Preemie, up to 5lbs, up to 17” 

Preemie, up to 6lbs, up to 18” 

NB (newborn), 6-9lbs, 18-21.5” 

3M, 9-12.5lbs, 21.5-24” 

6M, 12.5 - 17lbs, 24-27”

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2. It’s all in the details

Carter’s styles for preemie babies were designed with the help of NICU nurses and are available in three sizes: up to 5 pounds, up to 6 pounds and newborn up to 9 pounds. Our collection of preemie clothes features helpful design details that meet the unique needs of babies being medically monitored, such as the hook and loop closures at the arms, plastic snaps, and the footless design on preemie sleepers in our Sleep & Play collection.  

Baby Boy Preemie Sleep & Plays 

Baby Girl Preemie Sleep & Plays

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3. Buy in small quantities

Babies grow and change in what can seem like the blink of an eye. Rather than “stocking up” on baby clothes, try buying each size in small quantities. 

4. Choose soft fabrics

Newborns have sensitive skin, and preemie babies may be even more sensitive than full-term newborns. Choose gentle fabrics that will keep your baby comfy and cozy. Cotton blends and tagless clothing are ideal for most newborns. 

6. Don’t forget warm accessories

Hats are essential to keep babies warm. We offer preemie caps in various colors and styles, and in three sizes: up to five pounds, up to six pounds, and newborns up to nine pounds. Each cap is specially created for preemies using soft, stretchy material, a comfortable lining and a functional cuff. 

Mittens protect newborns from scratching themselves, but they can also keep their tiny hands warm. Choose from packs of mittens that are easy to put on and remove.  

7. Celebrate every milestone!

A stay in the NICU may feel like a bump in the road, but we want to help you celebrate your newborn. NICU-friendly bodysuits with sweet slogans, festive holiday designs and seasonal prints are sure to make you (and your little one’s medical crew) smile.

8. Go home in style

Celebrate your tiny warrior’s homecoming day with a sweet preemie outfit to remember. Will your little one be riding snugly in cozy matching organic cotton essentials? Eliciting oohs and aahs in a bodysuit and legging combo with adorable childhood characters? Or making a grand debut in a dress or ribbed two-piece set with a matching cardigan? No matter what you choose, the day will be one to remember forever. 

Baby Boy Preemie Sets 

Baby Girl Preemie Sets

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