Personalized Cute Turtle 3rd Birthday Toddler Long Sleeve T-Shirt. 3rd birthday I'm 3 Toddler Long Sleeve Tee - Heather with cute, smiling turtle with bow tie and party hat holding balloons and big red polka dot number three on his tummy. 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.