Personalized 3rd Birthday 3 Year Old Girls Rainbow Star Toddler Long Sleeve T-Shirt. Cute rainbow starburst with pink number 3 on a Toddler Long Sleeve Tee - Heather for celebrating a little girl's 3rd birthday. A classic for Fall, Winter and Spring, these long sleeve toddler t-shirts are sure to be a staple in your child's wardrobe. Whether layered or alone, this t-shirt is soft yet durable enough to stand up to your toddler's playtime demands.