Personalized Mommy Gym Buddy Workout Newborn Layette. Mommy's gym buddy Newborn Layette - Pink cute fitness workout outfit for boys or girls who hit the gym with their Mom. 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