Bella girl-1x1 Rib Short Sleeve Crewneck T-Shirt-9001 and the soft material of 1*1 baby rib knit is made from 100% 30 single combed ring-spun weighing 5.8 oz cotton. 3/8'neck and sleeve binding with Side-seamed for a fashionable custom contoured fit. As we know a baby grows even during his/her sleep and so they should be comfortable while napping. These are available in 18 amazing colors