Personalized Mom's Gym Buddy Fitness Workout Newborn Layette. Mom's gym buddy Newborn Layette - Pink workout apparel for kids who accompany Mom when he goes to the gym or does a work out at home. 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