One Giraffe 1st Birthday Onesie. Choose from 6, 12, 18, or 24 month sizes. Celebrate a fun and furry first birthday with our adorable Giraffe 1st Birthday Onesie! This pretty pink onesie features a precious giraffe and balloon design, and sweet lettering that lets everyone know who is one year old. Browse our fantastic selection of 1st Birthday Zoo Party Supplies and other animal themes, from tableware to decorations, and make your little one's birthday super special.