Carter's Baby Size Chart — Fit by Weight & Height
The Carter's baby-clothing size chart, size by size — the weight and height each label covers, and how Carter's compares with the median of the 30 brands in our Size Index. Based on the brand’s own published chart (retrieved 2026-09-02); we compare published charts and do not handle or test any garment.
Carter's published sizes sit about 0.3 lb above the 30-brand median on average across the 12 matching sizes below (our Size Index, which counts 13 Carter's sizes, averages +0.2 lb) — close to a typical chart, so buy your baby’s usual size.
Carter's baby size chart (weight & height)
| Size | Fits weight | Height | 30-brand median | Carter's vs median |
|---|---|---|---|---|
| Up to 5 lb | up to 5 lb | up to 17 in | — | — |
| Preemie | up to 6 lb | up to 18 in | 5.5 lb | +0.5 lb |
| Newborn | 6–9 lb | 18–21.5 in | 8 lb | +1 lb |
| 3M | 9–12.5 lb | 21.5–24 in | 12 lb | +0.5 lb |
| 6M | 12.5–17 lb | 24–27 in | 17 lb | 0 |
| 9M | 17–21 lb | 27–28.5 in | 20 lb | +1 lb |
| 12M | 21–25 lb | 28.5–30 in | 24 lb | +1 lb |
| 18M | 25–28 lb | 30–32 in | 27 lb | +1 lb |
| 24M | 28–30 lb | 32–34 in | 30 lb | 0 |
| 2T | 29–31 lb | 35–36.5 in | 31 lb | 0 |
| 3T | 31–33 lb | 36.5–39 in | 34 lb | −1 lb |
| 4T | 33–37.5 lb | 39–41.5 in | 38 lb | −0.5 lb |
| 5T | 37.5–42 lb | 41.5–44 in | 42 lb | 0 |
Read the “vs median” column to see where Carter's differs: a positive number means that size covers heavier babies than the typical brand (runs bigger on paper); negative means smaller. Compared across 12 matching sizes; our Size Index also counts the “Up to 5 lb” row as a Preemie size, so its Carter's average covers 13 sizes.
How we built this
There is no US standard for baby-clothing sizes, so the same label fits different weights at different brands. This page reproduces the Carter's published size chart and compares each size to the median of 30 brands from our Baby Clothing Size Index 2026. Figures are from the brand’s published chart (retrieved 2026-09-02); we compare published charts only and never claim to have measured or tested a garment. For clothing fit only — not a guide to how much a baby should weigh.