Our Milestone Number T-Shirts are the perfect celebration for your child's birthday. They'll wear it with pride all year long! Whistle & Flute clothes are designed to be Playful, Unisex and Cool. We want your kids to be comfortable at all times so we use the softest fabrics and all safest inks. We focus on quality so they can be worn for years to come. Care: We know the last thing you want to do as parents is to have kids clothes you need to fuss about. We suggest throwing it in with everything else on cold and tumble dry low. Content: 50% Bamboo rayon, 40 % Organic Cotton, 10% Recycled PolyesterSizing: Please make sure you select the correct size for the number shirt you wish to order. We find these run true to size.