Personalized It's My 8th Birthday with The Whatif Monster Infant Romper. There's no day like your birthday, so why not try something new? It's My 8th Birthday with The Whatif Monster Infant Romper - Heather, perfect for little fans of "Jonathan James and the Whatif Monster" by Michelle Nelson-Schmidt. Meet your new favorite outfit! Keep dressing simple with this one piece, lap shoulder t-romper. Super soft and perfect for baby's sensitive skin. 5.5 oz. 100% combed ringspun cotton premium jersey (CVC Colors are 60/40; Heather is 90/10 combed ringspun cotton/polyester)