My boys (ages 4 & 6), memorized Ephesians 6:10-18 (the Armor of God passage), so I am giving them this sweatshirt as a reminder of the Scripture they committed to memory. I would say, order a size up so there is room to grow! I ordered true to size for my boys and ended up giving my youngest his big brothers’ order and exchanging big bro’s for a larger size. Otherwise, they are so cute!