Size Chart

Designed To Fit Longer ✨

Size Guide

Our signature bamboo fabric is naturally soft, stretchy, and designed for longer wear, helping your little one stay cozy through more growing moments.

Zippies run Newborn to 24 months. Two-Piece Sets run 18-24 months to 5T. 18-24 months is the only size offered in both styles, so siblings can match there.

↔ Extra stretch for growing babies

☁ Buttery-soft bamboo comfort

✿ Designed for longer wear

Zippy Pajamas Size Guide

Size	Best Starting Fit	Many Families Wear Through*	Weight Range
Newborn (NB)	Preemie - Newborn	Up to 2M	Up to 8 lbs
0-3M	Newborn - 2M	Up to 6M	8-12 lbs
3-6M	3-5M	Up to 9M	12-16 lbs
6-12M	6-10M	Up to 18M	16-22 lbs
12-18M	12-16M	Up to 24M	22-27 lbs
18-24M	18-24M	Varies by fit preference	27-30 lbs

*Fit can vary based on your child’s height, growth pattern, and preferred fit. Our bamboo fabric is designed with extra stretch for longer wear.

Two-Piece Sets Size Guide

Our two-piece pajamas are designed with a close-to-the-body fit for sleepwear safety. If your little one has a fuller build or is between sizes, we suggest choosing the next size up. Two-Piece Sets are a long-sleeve top and matching pants, for toddlers, 18-24 months to 5T.

Size	Height	Weight
18-24M	31-33 in	26-30 lbs
2T	33-35 in	28-32 lbs
3T	35-38 in	32-35 lbs
4T	38-41 in	35-39 lbs
5T	42-48 in	39-48 lbs

Measurements are general recommendations. If height and weight correspond to different sizes, choose the next size up. Note: the 5T row above uses the official guide's combined 5/6 range (42-48 in / 39-48 lbs) — confirm this is correct for LBC's 5T before publishing.