Personalized Whatif Monster Birthday Girl Long Sleeve Creeper. There's no day like your birthday, so why not try something new? Whatif Monster Birthday Girl Long Sleeve Creeper - White, perfect for little fans of "Jonathan James and the Whatif Monster" by Michelle Nelson-Schmidt. For chillier weather, dress baby in this soft long sleeve creeper in a great fitting 1x1 baby rib. 5.0 oz., 100% combed ringspun cotton, 1x1 baby rib. White is sewn with 100% cotton thread, Flatlock seams, Double-needle stitched rib binding on neck, shoulders, sleeves and leg openings,Reinforced three-snap closure on binding.