Kaiya Baby Size Guide

Not sure which size to choose? Start with your baby's current height and weight, then match the product style. Age labels are a helpful starting point, but the safest fit is the size that sits securely at the neck and chest without feeling tight or riding up.

Use this guide for Kaiya Baby ClimaCuddle® swaddles, ClimaCuddle® baby bodysuits, ClimaCuddle® rompers, Basic Sleep Sacks, Walker Sleep Sacks, and Sleep Suit Sack 3-in-1.

• ClimaCuddle® Swaddle Size Chart
• ClimaCuddle® Baby Bodysuit Size Chart
• ClimaCuddle® Romper Size Chart
• Basic Sleep Sacks Size Chart
• Walker Sleep Sacks Size Chart
• Sleep Suit Sack 3-in-1 Size Chart

How to choose the right size?

Choose by height and weight first, not by age alone. Babies grow at different speeds, so the age range should be used as a guide, not the final decision.

If your baby is between two sizes, check the fit around the neck, chest, arm openings, and length. The fabric should allow natural movement, but the neck opening should never be loose enough for your baby's head to slip through.

If a size feels too small, move up. If the next size feels roomy around the neck or arm openings, wait before using it for sleep.

ClimaCuddle® Swaddle Size Chart

ClimaCuddle® swaddles are designed for newborns and young babies who need a secure wrap that will not ride up. Choose by your baby's current weight.

Fit note: The swaddle should feel secure without riding up. If your baby's head can pass through the neck opening, do not use that swaddle for sleep. Stop swaddling once your baby shows signs of rolling.

ClimaCuddle® Baby Bodysuit Size Chart

Use this chart for ClimaCuddle® baby bodysuits. The bodysuit should sit close to the body without pulling across the chest, shoulders, diaper area, or leg openings.

Fit note: Choose the size that stays smooth through the shoulders and diaper area. If the bodysuit rides up or leaves deep marks, size up.

ClimaCuddle® Romper Size Chart

Use this chart for ClimaCuddle® zipped baby rompers. The romper should zip smoothly, sit comfortably through the body, and leave room for natural hip and leg movement.

Fit note: Retire the romper if the zipper sticks or catches. A smooth zipper and easy movement are part of the fit check.

Basic Sleep Sacks Size Chart

Use this chart for Kaiya Baby basic sleep sacks, including sleeveless and long-sleeved sleep sack styles. These are designed to give babies wearable warmth while leaving room for natural leg movement.

Fit note: The sleep sack should sit comfortably at the shoulders and chest, with room for the hips and legs to move. Do not size up so much that the neck or arm openings become loose.

Walker Sleep Sacks Size Chart

Use this chart for Walker Sleep Sacks, including styles with foot openings for babies and toddlers who need more freedom to stand or move before and after sleep.

Fit note: Walker styles should allow natural steps without dragging or pulling at the shoulders. Retire the sleep sack if the zipper sticks, breaks, or catches.

Sleep Suit Sack 3-in-1 Size Chart

The Sleep Suit Sack 3-in-1 is made for older babies and toddlers who need separated-leg movement for rolling, crawling, standing, or moving around before and after sleep.

Fit note: Choose this style when your baby or toddler needs more leg separation than a traditional sleep sack. The fit should allow movement without dragging, twisting, or pulling at the shoulders.

Quick fit checklist

• The neck opening should sit close without slipping over the baby's chin or face.
• The chest should feel comfortable, not compressed.
• There should be room for the hips and legs to move naturally.
• The garment should not ride up during normal movement.
• The length should allow movement without extra fabric bunching heavily at the feet.
• Stop using any swaddle, bodysuit, romper, or sleep sack if the zipper sticks, breaks, or catches.
• Keep all Kaiya Baby sleepwear away from open flames, direct heat, and heat sources. Natural fabrics are not flame-resistant.

Still between sizes?

If your baby is between sizes, choose the size that gives the safest neckline and the most comfortable body fit today. Do not size up only to make the product last longer.

If you are choosing between two styles, think about how your baby sleeps and moves now:

• Choose a ClimaCuddle® swaddle if your newborn still needs a secure wrap and has not started showing signs of rolling.
• Choose a bodysuit if you need a close-fitting base layer for everyday wear or layering.
• Choose a romper if you need a zipped one-piece with leg coverage.
• Choose a basic sleep sack if your baby needs wearable warmth with a simple enclosed bag shape.
• Choose a Walker Sleep Sack if your baby or toddler needs foot openings for more movement.
• Choose a Sleep Suit Sack 3-in-1 if your baby or toddler needs separated-leg movement and convertible sleepwear.

If you are still unsure, contact us before ordering, and we will help you choose the best fit.