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Sizing & Fit

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How do your zippies fit?

Our zippies are designed to fit true to size with added stretch. That means: • They follow standard sizing for length and overall fit • Our bamboo fabric has natural stretch, allowing for extra wear over time • The fit is snug (by design), but flexible and comfortable Because of the stretch, many families find they can wear the same size longer than expected. If you’re between sizes or prefer a looser fit, sizing up is always a safe choice.

Last updated on Apr 10, 2026

Size Chart

We recommend choosing your size based on your child’s height and weight, rather than age alone. For a full size chart, please see this page. Because our fabric is stretchy, there is some flexibility within each size range. If your child is at the higher end of a range, we recommend sizing up for longer wear. For best results, compare your child’s current measurements to the product page size chart before ordering.

Last updated on Apr 10, 2026

When should I size up?

Sizing up depends on how your child fits within the current size range. We recommend sizing up if: • Your child is near the top of the weight or height range • You prefer a slightly roomier fit • You want to maximize how long the item will last Thanks to the stretch in our bamboo fabric, sizing up typically still fits comfortably—just with a little extra room to grow. If you’re unsure, sizing up is the most common choice.

Last updated on Apr 10, 2026

How long will each size last?

Every child grows differently, but our stretchy bamboo fabric is designed to extend the life of each size. On average, families find: • Each size lasts longer than traditional cotton sleepwear • The stretch allows for continued wear even as your child grows • Many babies wear the same size across a wider age range than expected Fit will gradually become more snug over time, but should remain comfortable throughout the size range. For the longest wear, consider sizing up when your child is between sizes.

Last updated on Apr 10, 2026

Do your products shrink?

Our bamboo fabric is designed to maintain its shape and softness over time. When cared for properly: • Minimal shrinkage may occur after the first wash • Fabric will relax again with wear due to its natural stretch • Overall fit and feel remain consistent For best results: • Wash cold • Tumble dry low or air dry Avoid high heat, as it can affect the fabric over time.

Last updated on Apr 10, 2026