Personalized Country Code Mexico Newborn Layette. Mexican pride Newborn Layette - White with the three letter country code for Mexico, MEX, and the flag of Mexico. Perfect for Cinco De Mayo. 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