cuteandfunnykids Kids - I Can't Keep Calm I am Going To Be a Big Sister - Toddler Shirt Baby Birth Pregnancy Made In the USA  Copyright Wallsparks. This copyright-protected design was created by Wallsparks, the ONLY Shop authorized to sell this product. 100% Cotton Soft Jersey Tee Shirt (Heather Grey 90%cotton/10% poly)  Size measurements: 6 Months (10" Body Width, 12.5" Body Length), 12 Months (11" Body Width, 13.5" Body Length), 18 Months (12" Body Width, 14.5" Body Length), 2T (13" Body Width, 15.5" Body Length), 3T (14" Body Width, 16.5" Body Length), 4T (15" Body Width, 17.5" Body Length), 5/6T (16" Body Width, 18.5" Body Length) Youth Short-Sleeve T-Shirt measurements width = Armpit to armpit: Unisex Standard size: Small (6-8): 15.5 width x 20.5 length, Medium (10-12): 17 width x 22 length, Large (14-16): 18.5 width x 23.5 length, XL (18-20): 20 width x 25 length Printed with water-based, eco-friendly inks. Prints are super soft and permanently dyed in the fabric while you can't feel the print on the fabric keeping the fabric super soft and comfortable. Each print is not a transfer which means it doesn't crack or peel or wash out. Our prints will continue to feel and look great even after many washes for many years. SIze advice: Measure your child from armpit to armpit and then compare the measurements on the size chart or measure one of your child's shirts, lay it flat and then measure it from armpit to armpit and compare those measurements on the size chart to see which size best fits.