Personalized Cardiologist In Training Childs Heart Doctor Newborn Layette. Cardiologist in training Newborn Layette - Light Blue for a boy or girl who want to be a future heart doctor. 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