Personalized Monster 4th Birthday Newborn Layette. Cute 4th birthday Newborn Layette - White with a funny cartoon purple monster, stars and polka dotted number 4 says THIS LIL' MONSTER IS FOUR! 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