Your child’s first Halloween is a super important one, so make sure you dress them in one of the cutest costumes around with Spirit! Our baby Halloween costumes come in all sorts of adorable ensembles for boys and girls so they can be a beloved animal like a monkey or lion, or a pop culture. Growing up is hard to do - so get a baby costume for adults from Candy Apple Costumes and just don 't grow up at all. Adult baby clothes are the perfect role reversal for making a fuss at a party, playing a trick on your kids or to get in the spirit at a friend 's baby . Jan 26, · Look for a romper or an adult onesie. Babies are often dressed in onesies. If you can find an adult sized onesie at a department store, especially if it has footies, this is a great option for a baby costume%(88).