Adorable Originals I'm the Big Brother T-Shirt: Let the new big brother know just how special he is! This cute T-Shirt lets him proudly proclaim his new big brother status. Makes a thoughtful gift for the big brother when his new brother or sister is born. Available in X-Small (2-3 years) or Small (3-4 years). The Adorable Originals I'm the Big Brother T-Shirt is made of 50% Cotton 50% Polyester. Machine wash inside out. Tumble dry low.