Baby Coming! Big Sister & Little Sister T-Shirt & 6-Months Bodysuit 2-Piece set: One (1) T-Shirt (choose size) & One (1) 6-Month Bodysuit included. 6-Month bodysuit fits babies 12-18 lbs. approx. Toddler shirts run small, you may want to order a size up. Please choose your t-shirt size. The bodysuit is 6-Months size. When choosing the 18-month T-Shirt size, please be aware it is a lap t-shirt. All other sizes are crewneck t-shirts. Youth sizing: X-Small (2-4); Youth Small (6-8); Youth Medium (10-12); Youth Large (14-16); Youth XL (18-20). Both the T-Shirt and bodysuit are 100% cotton. Great gift for expectant moms/dads!