For all kiddos already starting to show a discerning palate! Also, this onepiece makes a high quality present. Mamas, be assured that the thick cuffs, leg openings, and neckline hugs babies, and will continue to be snug, even after washing, and will last for years to come. Hello, hand-me-downs! *GOTS Certificate Registration No: 819511. Age and Weight: NB: 5-7 lbs; 0-3M: 7-12 lbs; 3-6M: 12-16 lbs; 6-12M: 16-24 lbs; 12-18M: 24-30 lbs.