Tee shirts run a size small.A 2t shirt in this style shown fits a 12-18m. 3t fits a 2, 4t fits a 3 and so on. If your unsure about the size state on the order form and I will email you some measurements. Toddler shorts run true to size. Childrens sweat suit sold below. Please put the date you need your birthday clothing in the comment box at the end of the order form.