Personalized Funny Hydraulic Engineer Newborn Layette. Funny Hydraulic Engineer Newborn Layette - Heather say "Flow Rate Beer Hydraulic Engineer" in white text and makes a fun gift design for ale loving engineers! 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