Personalized 3rd Birthday 3 Year Old Girl Outfit Toddler Long Sleeve T-Shirt. This cute 3 year old birthday idea has a lion wearing a party hat for a little girl. 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.