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Basic Sleep Sacks Size Chart

Basic Sleep Sacks Size Chart

Size Height Weight
0-6 Months 21-27"(53-69CM) 7-18LB (3-8KG)
6-18 Months 26-33"(66-84CM) 16-27LB (7-12KG)
18-36 Months 32-39"(81-99CM) 25-36LB (11-17KG)
  • Sleep Sack Sizes are based on the weight and size of your baby.
  • Our sleep sacks are made a little longer to give babies enough room to kick and grow, which will make your little one more comfortable. 
  • If the baby's head can pass through the neck hole when using the fixed sleep sack. do not use it.
  • Here are a couple things to note before you purchase:
    -In February 2025, we began updating the size of Essential Sleep Sacks in 18M-3T. We are still selling the original versions in order to reduce waste. Until all old inventory sells through, we are unable to guarantee which version you receive.
    We want you to love every Kaiya Baby piece you receive! If you have any questions or concerns about your order, please contact us at service@kaiyababy.com.