XY Boy Chromosome Baby Blue Infant One Piece by katyANDzucchini. Let people know what chromosomes fill your child's DNA. A more subtle way of announcing the sex of your new baby. We love this line from indie screenprinter katyANDzucchini! Derived from science and wit, these shirts offer simple yet intellectually satisfying designs on 100% cotton one pieces. The garment is manufactured overseas. Each design is then hand screen-printed with love on 100% cotton baby one pieces using earth-friendly methods right here in the USA!