Baby Size Chart
Pick by your baby's height and weight, not the age on the tag. Our baby chart runs from 0-3M (21-25 in, 12-15 lbs) to 18-24M (31-34 in, 26-30 lbs). If height and weight point to different sizes, or your baby is between sizes, size up one.
Use this chart before ordering. If your child is between sizes or you need help with fit, email service@themossriver.com with the product name and the size you are considering.
| Size | Height (in) | Height (cm) | Weight (lbs) | Weight (kg) |
|---|---|---|---|---|
| 0-3M | 21-25 in | 53-64 cm | 12-15 lbs | 5.4-6.8 kg |
| 3-6M | 24-27 in | 61-69 cm | 15-18 lbs | 6.8-8.2 kg |
| 6-12M | 26-30 in | 66-76 cm | 18-22 lbs | 8.2-10.0 kg |
| 12-18M | 29-32 in | 74-81 cm | 22-26 lbs | 10.0-11.8 kg |
| 18-24M | 31-34 in | 79-86 cm | 26-30 lbs | 11.8-13.6 kg |
Product cuts can vary. When a product page includes additional fit notes, use those notes together with this chart.
Pick by height and weight, not by age
The tag says months, but every brand sizes differently. Which size do I pick? Go by your baby's height and weight on the chart above, not the age on the tag. For example, our 6-12M covers 26-30 in and 18-22 lbs, and our 18-24M covers 31-34 in and 26-30 lbs. If height and weight point to different sizes, or your baby is between sizes, size up one.
Tall baby, big feet, or growing fast? The mystery-print Loose Fit zip romper (1M to 9M) is our roomier cut, and the Christmas Gifts footie has convertible footies. For fast growth, the mystery-print Snug Fit 3-Pack ships three zip rompers in one order, in 1-3M to 18-24M.
FAQ
How do I choose my baby's size?
Use your baby's height and weight on the chart above, not the age on the tag. For example, our 6-12M covers 26-30 in (66-76 cm) and 18-22 lbs (8.2-10.0 kg).
My baby is between sizes. Which size should I buy?
Size up one. Also size up if height and weight point to different sizes.
What baby sizes does this chart cover?
0-3M, 3-6M, 6-12M, 12-18M and 18-24M. A few products list their own range, such as the Loose Fit zip romper in 1M to 9M, so check the product page too.
What does snug fit mean?
Our kids' sleepwear (sizes 9M+) is cut to a snug fit and is never treated with flame retardants. MossRiver kids' sleepwear styles are tested to applicable CPSC requirements. Baby sizes under 9M are exempt from these rules.
How do I choose a kids' size from 2-3Y to 6-7Y?
Use our Children's Size Chart, which covers kids' long-sleeve two-piece sizes 2-3Y to 6-7Y. Cuts vary by product, so read the fit notes on each product page.
Is the chart in cm and kg?
Yes. Every size row lists height in inches and cm and weight in lbs and kg.
Do your Christmas pajamas run small?
They can feel small, because our kids' sleepwear is snug-fitting by design. Choose by height; if between two sizes, pick the larger one. The baby chart above and our women's size chart and men's size chart list height; for kids 2-3Y to 6-7Y, compare your child's measurements with our Children's Size Chart and pick the larger size if they fall between two. Kids' sleepwear should be worn snug-fitting.
Are adult and kids sizes in a family set the same fabric?
It depends on the set, and each product page lists its fabric. In the navy Christmas Gifts family set and the King & Princess family set, the women's, men's, kids and baby sizes are all viscose made from bamboo. Our other Christmas family sets, such as the Snowman family set, are polyester in adult and kids sizes.
Do your family sets come in larger women's sizes?
Yes. The King & Princess family set, the navy Christmas Gifts family set and the Christmas Elf family set come in women's sizes up to XXL, and sets such as the Snowman family set and the Let It Snow family set come in women's sizes up to XL. Compare chest, waist, height and weight on our women's size chart, then pick your size in the menu on the product page.
Who can help me with fit?
Email service@themossriver.com with the product name and the size you are considering.
What if the size I order does not fit?
30-day returns. Clearance and final-sale items are not returnable. Refunds are issued within 10 business days. EU customers also keep their statutory 14-day right of withdrawal. Items must be unworn, unwashed and in original packaging with tags attached. See the return policy.