Personalized Cupcake 3rd Birthday Toddler Long Sleeve T-Shirt. Happy 3rd birthday toddler! Celebrate your little girl's third b-day with a pink bird, party balloons and a 3 candle atop a cupcake. Happy birthday three-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.