Little Sleepies offers both preemie and newborn as size options for Zippies, and newborn is the larger of the two. If you're deciding between two sizes for Zippies, start with the fit you want first: a smaller size for a closer fit, or a larger size for a roomier one.

Start With Fit

When you're choosing between early sizes, the clearest place to start is how you want the sleeper to fit right away. A closer fit may point you toward the smaller option, while a little more room may make the larger option feel like the better pick. It’s a simple decision, but in the newborn stage, simple is doing a lot of heavy lifting.

Why Zippies Work So Well Early On

Once you’ve narrowed down size, the practical details matter most. Zippies are made from custom-milled Lunaluxe® Bamboo that’s gentle on sensitive or eczema-prone skin. Fold-over mittens and a double zipper help with everyday changes, without turning this into a whole production.

Comparing Preemie and Newborn Zippy Sizes

One key consideration is how you want the fit to feel at the start. Sizing may vary, so it helps to compare your baby’s current size with the brand’s size guidance. If you want a closer starting fit, a smaller size may be worth considering. If you want a roomier starting fit, a larger size may be the better option.

What You’ll Still Get With Zippies

You’ll still get the Zippy details parents love most: buttery soft Lunaluxe® Bamboo, fold-over mittens, convertible leg cuffs, and a double zipper for easier changes. The seasonless fabric is designed to keep baby cool in the summer and cozy in the winter, and the tag-free construction helps keep things feeling comfortable during long stretches of wear.

How to Make the Call

If you’re shopping for your own baby, think about the fit you want first. If you’re buying a gift, it can help to think about when the sleeper will likely be worn. Either way, Zippies are made to fit up-to-3x longer than the average sleeper, so the design is built with a little flexibility in mind once you’ve chosen your starting size.

How to Choose Without Overthinking It

Start with the fit you want on day one. If your goal is a closer fit, a smaller size may make sense. If you’d rather leave a little more room, the larger size may be the better place to start. That’s the main decision.

What Makes This Style Helpful

Zippies are designed for real newborn life, which means frequent changes, uneven sleep, and a lot of laundry for someone so small. Fold-over mittens help protect tiny cheeks, convertible leg cuffs switch from footless to footed, and the double zipper makes diaper changes easier. The zipper cover and tag-free design add comfort where it counts.

When Longer Wear Matters

If you’re building a registry or buying a gift, it helps to know this style is made to fit up-to-3x longer than the average sleeper. That doesn’t replace choosing the right starting size, but it does add flexibility once you’ve made your pick. For many families, that’s one less thing to second-guess.

Why Parents Reach for Little Sleepies

The early days can be sweet, messy, emotional, and a little blurry around the edges. Little Sleepies is built for that real version of parenthood, not the polished one. We focus on softness, practical details, and pieces that help make everyday routines feel a bit easier.

Zippies are made from custom-milled Lunaluxe® Bamboo that’s gentle on sensitive or eczema-prone skin, with seasonless comfort that works across warmer and cooler days. Thoughtful features like convertible feet, fold-over mittens, and a double zipper are there for a reason: because parents do not need more friction at 2 a.m.

There’s heart behind the details, too. Little Sleepies proudly donates a portion of every sale to Alex's Lemonade Stand Foundation for Childhood Cancer. So when you shop, you’re choosing comfort for your family and supporting something meaningful beyond the nursery drawer.