Personalized T-Rex 1st Birthday Newborn Layette. T-Rex 1st Birthday! A cute T-Rex dinosaur holds a bright red balloon to celebrate the one year olds first birthday! Adorable gift! 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