Mashed Clothing Unisex-Baby Best Little Brother Ever Bodysuit Approximate sizing: Newborn (up to 7 pounds), 6 Months (7-17 pounds), 12 Months (17-25 pounds), 18 Months (25-30 pounds), 24 Months (31-35 pounds.) Premium fine jersey, ringspun cotton. Feels soft and smooth. Excellent quality. Please see the images for the official Mashed Clothing size charts. The ones provided by Amazon are not accurate.