Personalized 1st Birthday Puppy Blue Newborn Layette. I'm one! A cute blue puppy dog with a birthday hat and a cupcake with a 1 shaped candle. Happy 1st birthday to the 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