Personalized 1st Birthday Mermaid Party Newborn Layette. Cute 1st birthday mermaid Newborn Layette - Light Blue with a blue mermaid tail for a fun 1 year old party photo for a baby girl. 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