Find their size
Size by height and weight, not age. Babies don’t read calendars. Our pajamas fit snug on purpose and bamboo stretches, so if you’re between sizes, size up.
| Size | Age | Height | Weight |
|---|---|---|---|
| Newborn | 0–1 mo | 17–21.5″ | 5–8 lb |
| 0–3 mo | 0–3 mo | 21.5–24″ | 8–12 lb |
| 3–6 mo | 3–6 mo | 24–26.5″ | 12–17 lb |
| 6–9 mo | 6–9 mo | 26.5–28.5″ | 17–20 lb |
| 9–12 mo | 9–12 mo | 28.5–30.5″ | 20–24 lb |
| 12–18 mo | 12–18 mo | 30.5–32.5″ | 24–28 lb |
| 18–24 mo | 18–24 mo | 32.5–34.5″ | 28–32 lb |
| Size | Age | Height | Weight |
|---|---|---|---|
| 2T | 2 yr | 33–36″ | 28–32 lb |
| 3T | 3 yr | 36–39″ | 32–37 lb |
| 4T | 4 yr | 39–42″ | 37–42 lb |
| 5T | 5 yr | 42–45″ | 42–47 lb |
| 6T | 6 yr | 45–48″ | 47–52 lb |
| 7T | 7 yr | 48–51″ | 52–58 lb |
All measurements are the child’s body, not the garment. The Adult 2-Piece comes in XS to XL.
Why snug isn’t optional
US law (16 CFR Parts 1615 and 1616) requires children’s sleepwear to be either flame-resistant or snug-fitting. We chose snug: no chemical flame retardants, and no extra fabric bunching up around a sleeping baby.
So our pajamas look fitted, not flowy. If you can slip a finger between fabric and skin almost everywhere, it’s probably a size too big.
When to size up, and how to measure
Size up when…
- They’re between sizes by weight. Pick the larger one. Bamboo gives a little, but it shouldn’t pull at the thighs or shoulders.
- They’re long for their age. Length matters most in footed pajamas. Size up if their last pair pulled at the toes.
- A growth spurt is coming. If they’re at the top of the range, go one up.
How to measure
- Weight: your pediatrician’s last reading, or weigh yourself holding them and subtract your own weight.
- Height: lay them on their back on a firm surface. Mark the top of the head and the heel, then measure between the marks.
- Shortcut: if a footed pajama they own fits well right now, start with the same size in ours.
Gifting, newborns and the end of a size
Buying a gift
Baby not here yet? Skip Newborn, which most babies outgrow in a few weeks. 0–3 or 3–6 months gives a much longer wear window.Newborns
Most full-term babies start in Newborn (5–8 lb) and move to 0–3 months within the first month or so.The end of a size
At the top of the weight range and the feet are pulling? It’s time. Don’t squeeze out another wear.
Still not sure? We make it easy.
Order a size, try it on, and if the fit is off you have 30 days to send it back unworn.