Indigo Blue Watercolor Floral Art Print Baby Onesie White T-shirt. 100% Organic cotton long sleeve white one-piece for infants 3 months to 24 months. This baby onesie is designed for maximum comfort. Made with a baby rib knit to ensure a smooth touch and good stretch, and durability. It features a 3 snap closure and a cleverly constructed neckline designed for easy on-and-off.