How to Choose the Right Size in Little Sleepies Pajamas for Babies and Kids

Quick Answer

For the best fit, choose Little Sleepies pajamas based on your child's current weight and height, not age. If your child is between sizes or you want room to grow, size up—the bamboo fabric stretches, but a snug fit is safer for sleep. Always check the size chart for each specific style, as some fits vary.

Choosing the right size in Little Sleepies pajamas can feel tricky because the bamboo fabric is designed to stretch and move with your child. Unlike stiff cotton pajamas, these sleepers have a soft, flexible fit that can accommodate growth spurts. But that also means the sizing logic is a bit different from what you might be used to.

This guide breaks down how to read the size chart, when to size up, and what to expect from the fit of different styles. We'll also share practical tips for measuring your child and avoiding common sizing mistakes.

Understand the Fit: Snug vs. Roomier

Little Sleepies pajamas are made from Lunaluxe® Bamboo, a buttery-soft fabric that stretches. The fit is designed to be snug but not tight, following safety guidelines for children's sleepwear. This means the pajamas should hug your child's body without leaving excess fabric that could bunch up.

Because the fabric stretches, many parents find that their child can wear the same size for longer than expected. However, if you prefer a looser fit for older kids or for lounging, sizing up can work—just be mindful that overly loose sleepwear isn't recommended for babies under 12 months.

• Check the size chart for weight and height ranges, not just age.
• If your child is at the top of a size range, consider sizing up for longer wear.
• For babies, prioritize a snug fit for safety.

How to Measure Your Child

To get the most accurate size, measure your child's height and weight. For height, have them stand against a wall and mark the top of their head. For weight, use a home scale or check recent doctor's visit data. Then compare these numbers to the Little Sleepies size chart.

If you're between sizes, it's usually better to size up, especially if your child is close to the next size's weight range. The stretchy fabric will still provide a comfortable fit, and you'll get more wear out of the pajamas.

• Measure height and weight, not just age.
• Use the larger size if your child is between sizes.
• Consider your child's growth rate—if they're in a growth spurt, size up.

Style-Specific Fit Considerations

Different Little Sleepies styles fit differently. The Zippy and Shorty Zippy are one-piece sleepers with a snug fit and double zippers for easy changes. The Shorty Zippy, like the Purple Game On Shorty Zippy, has short sleeves and legs, making it ideal for warmer nights—but the fit is similar to the full-length Zippy.

Two-piece pajama sets and daywear like rompers and skorts may have a more relaxed fit. For example, the Halloween Haul Bubble Romper has a snappable bottom and flutter sleeves, which adds a bit of roominess. Always check the product description for specific fit notes.

• One-piece sleepers (Zippy, Shorty Zippy) are snugger than two-piece sets.
• Rompers with snaps or flutter sleeves may have a more relaxed fit.
• Read product descriptions for fit details like 'snug' or 'relaxed'.

Decision Rules for Choosing the Right Size

• If your child is between sizes: Size up. The bamboo fabric stretches, so a larger size will still fit snugly, and you'll get longer use. When in doubt, size up.
• If you're buying for a baby under 12 months: Prioritize a snug fit for safety. Avoid sizing up too much, as excess fabric can be a hazard during sleep. Snug is safe.
• If you're buying for a toddler or older child: Consider your child's comfort preference. Some kids like a looser fit for lounging, so sizing up is acceptable. Comfort matters for older kids.

Product Fit Insights

• Purple Game On Shorty Zippy: Made from ultra-soft Lunaluxe® Bamboo that's gentle on sensitive skin, this bamboo baby sleeper has an easy double zipper for quick changes. Plus, the short style is perfect for warmer nights. The short style is great for warmer weather, but the fit is still snug like a traditional sleeper. Use the size chart for weight and height to ensure a safe, comfortable fit.
• Halloween Haul Bubble Romper: Made from soft Soluxe® Bamboo, the Halloween Haul Bubble Romper has flutter sleeve details and a snappable bottom for easy changes. The bubble silhouette and flutter sleeves give this romper a slightly roomier feel than a fitted sleeper. If you're between sizes, you might prefer sizing down for a closer fit, but sizing up is fine for a looser look.

Fit Guidance: Who Should Size Up or Down

Best for sizing up

• Children between sizes or at the top of a size range
• Parents who want to extend the life of the pajamas through growth spurts

Not for sizing up

• Babies under 12 months who need a snug fit for sleep safety
• Parents who prefer a precise, form-fitting look

Choosing the right size in Little Sleepies pajamas comes down to measuring your child, understanding the stretchy bamboo fit, and knowing when to size up. Use the size chart as your guide, and when you're between sizes, sizing up is usually the smart choice—especially for growing kids. With the right fit, your little one will sleep comfortably and safely.