Not Just a Kids Jumpsuit.
The Kids Jumpsuit.
We didn't design another onesie for kids. We designed the one piece your child actually wants to live in — and the one you'll reach for every single morning.
The Diagonal Zipper
From collar to knee — one clean, continuous line. The F&O diagonal zipper isn't just a design detail. It's the reason parents call this the fastest kids onesie to get on and off. No snaps to fumble with. No buttons to miss. One smooth zip and your child is dressed, out the door, and ready for whatever the day holds.
The asymmetric line runs from the right collar across the chest and down to the left knee, creating a silhouette that looks intentional, modern, and unlike any other jumpsuit for kids on the market.
- Full-length YKK zipper — smooth, snag-free, built to last
- Collar-to-knee diagonal cut for effortless dressing
- Chin guard to protect sensitive skin
- Works for diaper changes without fully undressing
Two Zippered Back Pockets
Little adventurers collect things — rocks, leaves, snacks, tiny treasures. The Coastal One Piece has two zippered back pockets so nothing gets lost along the way. Secure enough for the playground, subtle enough that the clean silhouette stays intact.
Every detail on this kids jumpsuit outfit was designed with real parents and real kids in mind. Because a jumpsuit for kids should work as hard as they play.
- Two back pockets with hidden zippers
- Sized for little hands and little treasures
- Flat-seam construction — no bulk, no irritation
- Stays closed during tumbles and climbing
The Hood That Actually Fits
Most kids hooded onesies have hoods that are too big, too floppy, or sewn as an afterthought. The F&O hood is contoured to a child's head — snug enough to stay on during wind, loose enough that it never feels restrictive.
Whether it's a chilly morning walk or a cozy evening in, this hooded onesie for kids adds warmth without adding weight. No drawstrings, no toggles — just safe, clean design for children 12 months to 4 years.
- Contoured hood — proportioned for toddler heads
- Double-layered for warmth without bulk
- No drawstrings — safety-first design
- Stays put during movement and play
The Kids Onesie That Does More
Every F&O piece is designed to simplify your morning, outlast your child's energy, and look good doing it. Here's what sets our kids jumpsuits apart.
One Piece, Out the Door
No matching tops and bottoms. No outfit debates. This jumpsuit for kids is a complete outfit in one zip — the fastest way to get dressed and stay dressed all day.
Onesie Pajamas & Daywear
Soft enough for kids onesie pajamas at bedtime, styled enough for daytime adventures. One piece that works around the clock — from morning cartoons to afternoon playgrounds.
Grows With Them
The relaxed fit and stretchy organic cotton mean this kids jumpsuit outfit lasts through growth spurts. Sizes 12M through 4T — designed to be lived in, not outgrown overnight.
Big Kid Energy
Our big kid onesies are made for children who don't stop moving. Reinforced knees, breathable fabric, and a fit that keeps up — whether they're climbing, running, or rolling in the grass.
Machine Washable
Throw it in, pull it out, done. F&O onesies for kids get softer with every wash. No special care, no hand-washing — just real clothes for real life with kids.
Nature-Inspired Colors
Sage green drawn from coastal mornings. Neutral tan inspired by sun-washed sand. F&O colors are intentional, timeless, and designed to mix with everything in their closet.
Questions About Our Kids Jumpsuits
The F&O Coastal One Piece features a signature diagonal zipper that runs from the collar to the knee — a design you won't find on any other jumpsuit for kids. Combined with two zippered back pockets, a contoured hood, and organic cotton blend, it's a kids jumpsuit built for both style and function.
Absolutely. The Coastal One Piece works as onesie pajamas for kids and as daytime wear. The soft organic cotton is breathable enough for sleeping and durable enough for all-day play. Many F&O parents use it as both — kids onesies pajamas at night, adventure wear during the day.
The Coastal One Piece comes in sizes 12M, 2T, 3T, and 4T. It fits children from approximately 12 months to 4 years old. The relaxed fit means it runs true to size with room to grow. If your child is between sizes, we recommend sizing up. We also carry big kid onesies in our extended size range.
Yes — every Coastal One Piece includes a contoured hood that's proportioned for toddler heads. Unlike most kids hooded onesies, the F&O hood is designed without drawstrings for safety. It stays put during wind and play but never feels tight or restrictive.
While a kids mechanic jumpsuit is designed for utility and work, the Fox & Ocean Coastal One Piece is designed for everyday comfort and style. The diagonal zipper, organic cotton fabric, and nature-inspired colors make it a premium kids jumpsuit for everyday wear — soft enough for naps, stylish enough for outings.
Yes — Fox & Ocean ships kids onesies across the US with free USPS standard shipping on all orders. Estimated delivery is 7-10 business days. Expedited UPS/FedEx shipping is also available. We offer 30-day returns and free exchanges on all sizes.
Absolutely. The Coastal One Piece is a unisex kids jumpsuit designed for all children. The nature-inspired Sage and Neutral colors work beautifully for girls and boys alike. Whether you're looking for a girls kids summer jumpsuit or an everyday onesie for any child, F&O has you covered.
Our current size range goes up to 4T. We're working on extending into big kid onesies and big kid onesie pajamas for children ages 5 and up. Join our newsletter to be the first to know when larger sizes drop.
Most kids onesies pajamas are made from synthetic blends and designed only for sleep. The F&O Coastal One Piece is GOTS-certified organic cotton blend, features a unique diagonal zipper for easy dressing, and is styled for both daytime wear and bedtime comfort. It's an onesie for kids that works around the clock.
One Piece. Every Day. Every Adventure.
The kids jumpsuit that parents reach for first and kids never want to take off. Available in Sage and Neutral — sizes 12M to 4T.
Shop The Coastal One Piece