Personalized Baseball 1st Birthday Newborn Layette. Baseball league sports 1st birthday boy with baseball bats. Cute sports themed 1-year-old b-day baby party gifts. Happy Birthday one-year-old! 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