Personalized Whatif Monster Birthday Girl Newborn Layette. There's no day like your birthday, so why not try something new? Whatif Monster Birthday Girl Newborn Layette - White, perfect for little fans of "Jonathan James and the Whatif Monster" by Michelle Nelson-Schmidt. 100% combed ringspun cotton 5.8 ounce 1×1 baby rib sleeper. 3/8" flatlock binding at envelope neck and cuffs. Back sleeve flap to protect hands. Elastic opening at bottom. Infant: 0-3 Months