Onesies or rompers make handy apparel options for infants every day, so it's no surprise that they make perfect costumes for Halloween and beyond. Costume onesies are also fun for photo shoots, family gatherings, and other holiday events. Prices vary per size in some of the costume onesie outfits in this collection. Remember that prices also fluctuate on Amazon -- the prices here were under $25 at the time of publication.
Your baby will be as soft as a plush teddy bear in this fuzzy cute animal onesie! The little bear costume has a bright green bowtie. This romper costume comes with matching booties.
This is a funny Halloween costume idea for your little one! The convict striped onesie includes sheer "tattoo" sleeves the make your baby look bad to the bone!
This fluffy pig suit for babies is so darling! Complete with an eared, snouted pink piggie hood.
This plush onesie is perfect with big lion feet and massive lion mane. Includes little mouse rattle to keep the thorns out of your little lion's feet.
This cute costume is perfect for your own little monster! This plush pink onesie comes with fuzzy feet and monster head with horns attached.
This is an adorable costume for your baby this Halloween or photo session. The cow costume includes tail, floppy ears, and small plush horns. The cute cow has a pink belly and big pink nose. So cute!
The officially licensed TMNT costume is shown here transforms your kiddo into Michealangelo! The costume is also available with a purple sash -- making your child's costume Donatello. Get them both for a fun twin costume idea!
This full polyester one-piece suit is perfect for Halloween and cute photo ops. The orange striped outfit is cartoonishly cute for your little tiger!
Your baby will be raging cute in this green muscle-print Incredible Hulk costume onesie. The romper outfit comes with an adorable Hulk beanie hat!
How cute is this fuzzy and whimsical unicorn costume romper for infants?! The hood features a smiling unicorn face and a plush pink striped unicorn horn.
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This is a set of five cute onesies with adorable Marvel superhero prints. These comfortable cotton/poly blend bodysuits are perfect for everyday use -- and they can do double duty during the spooky season as easy Halloween costumes for baby!
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Popular costume themes from 2017 included Disney's Descendants, Guardians of the Galaxy, and outfits for pets. Scary costumes and fun accessories were also big sellers on this website last year. Check out our top-10 best-seller list from 2017! Maybe these will inspire you for Halloween 2018!
