RuffleButts Infant/Toddler Girls Pink Short Sleeve Birthday T-Shirt 92% Cotton / 8% Spandex Imported / Designed in the USA This RuffleButts product is backed by our 100% Happiness Guarantee Machine wash cold; gentle cycle; tumble dry low The number on the shirt corresponds with the size of the tee: Size 12-18m - Number 1, Size 2T - Number 2, Size 3T - Number 3, Size 4T - Number 4, Size 5 - Number 5, Size 6 - Number 6