Dress it up or down. This boy's necktie onepiece can be casual and dressed up all at once. Also, it 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.