Sizing guide
What size pajamas for a 9-month-old?
Most 9-month-olds fit 6-12M.
The 6-12M fits babies from 16 to 22 lb and 25 to 29 inches. Most babies are in this range from about 6 to 12 months, but weight varies — check your baby’s current weight to confirm.
Age is a starting point. Weight tells you whether the size will actually fit. A 9-month-old who is 18 lb fits 6-12M comfortably. A 9-month-old who is 24 lb will fit 12-18M better.
Our pajamas are cut to fit snugly, which meets CPSC fire-safety standards without added flame retardants. Choose the size that fits your baby’s current weight.
Full weight-first size chart
| Size | Weight | Height | Typical age |
|---|---|---|---|
| NB | Up to 10 lb | Up to 21.5 in | Newborn–4 weeks |
| 0-3M | 8–13 lb | 21–24 in | 1–3 months |
| 3-6M | 12–17 lb | 23–26 in | 3–6 months |
| 6-12MMost 9-month-olds | 16–22 lb | 25–29 in | 6–12 months |
| 12-18M | 20–27 lb | 28–32 in | 12–18 months |
| For child’s safety, garment should fit snugly. This garment is not flame resistant. Loose-fitting garment is more likely to catch fire. | |||
| 18-24M | 24–30 lb | 30–34 in | 18–24 months |
| For child’s safety, garment should fit snugly. This garment is not flame resistant. Loose-fitting garment is more likely to catch fire. | |||
| 2T | 27–32 lb | 32–36 in | 24–30 months |
| For child’s safety, garment should fit snugly. This garment is not flame resistant. Loose-fitting garment is more likely to catch fire. | |||
Babies vary. Weight is the best predictor of fit. Height helps when baby is at the edge of two ranges.
Shop 6-12M footie pajamas
All five colorways are available in 6-12M, knit from 95% viscose from bamboo, 5% spandex.
More sizing guides: Pajama size by weight · Newborn vs 0-3M