Size Guide

Find the Perfect Sleep Sack Size

Choose the right size based on your child's age and height. Our guide features parent-tested recommendations for every stage from newborn to big kids.

Newborn & Tiny (0-6 months)

Infant (6-18 months)

Toddler (18-36 months)

Big Kids (2-4 years)

Extended Sizing (4+ years)

🏆 Best for Tall Toddlers

These brands are praised by parents of tall or 99th percentile children for their generous length and room to grow.

How to Measure for the Right Size

Measure Height
Lay your child flat and measure from head to toe. Add 2-3 inches for growth room.
Check Weight
Most brands list weight ranges. Choose based on current weight, not age alone.
Consider Growth
Size up if between sizes. Sleep sacks should have room to kick and move.
Read Reviews
Check parent feedback about fit - some brands run large or small.