Personalized Princess 4th Birthday Toddler Long Sleeve T-Shirt. Pink Princess 4th birthday. This pink heart with a jeweled tiara will make your little girl's fourth b-day special. Happy birthday 4-year-old! 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.