The T shirt is 100%Cotton and fits true to size !!!Baby��s Pattern is "BE FRI"，adult Pattern is "ST END".Together Mean'BEST FRIEND" Very popular Family set.This is For your baby ，9.99 is the price for baby T-shirt and if you need for mum ，pls go to my shop and look for it !Link Here: https://www.wish.com/c/56d55de02985df65de688287HOW TO CHOOSE BABY SIZE? Usually 12M means size 80 suitable for 0-1 years old， height 75-85cmUsually 2T means size 90 suitable for 1-2 years old， height 85-95cmUsually 3T means size 100 suitable for 2-3 years old， height 95-105cmUsually 4T means size 110 suitable for 3-4 years old， height 105-115cm