Unisex Baby Keep Calm It's Daddy's First Father's Day Baby T-Shirt Bodysuit Approximate sizing: 6 Months (7-17 pounds), 12 Months (17-25 pounds), 18 Months (25-30 pounds) 5.0 oz., 100% Combed Ringspun Cotton in a 1x1 Baby Rib Double-needle rib binding on neck, shoulders, sleeves and leg openings Reinforced three-snap closure for easy diaper changes