Skip to top navigationSkip to shopping bagSkip to main contentSkip to quick filtersSkip to product filtersSkip to footer links
Open and use a Navyist Rewards Credit Card & get an extra 30% off* your first purchase. Apply Now.Open and use a Navyist Rewards Credit Card & get an extra 30% off* your first purchase. Apply Now.
on logo lighton logo dark

Baby Onesie Costumes

18 items
Size Variant
to
18 items

BABY ONESIE COSTUMES

Looking for adorable and comfortable baby onesie costumes? Look no further than Old Navy. Our collection of baby onesie costumes is perfect for Halloween, dress-up parties, or just for fun. These costumes are designed with your baby's comfort in mind, so they can play and explore without any restrictions. Made from soft and breathable fabrics, our baby onesie costumes are gentle on your little one's delicate skin.

Our baby onesie costumes come in a variety of cute and creative designs, from critters to animals. Each costume features a hooded one-piece design, keeping your baby cozy and warm. The easy snap closures make dressing and changing a breeze. Whether your baby wants to be a cute critter or a fierce tiger, our baby onesie costumes are sure to bring smiles and joy to everyone around. Shop our collection now and let your baby's imagination run wild!