Shirts By Sarah Big Girl's Big Sister EST. 2017 T-Shirt Sibling Matching Shirts Sizes XS-XL are big girl's sizes. Only 2T, 3T and 4T sizes are little girl's on the size chart. This adorable shirt is a great way to get your daughter excited about becoming a big sister. Also works as a cute baby reveal idea. T-Shirt includes Shirts By Sarah's printed cotton drawstring gift bag. Proudly Printed In U.S.A. 100% Heavy Weight Cotton