Personalized Puppy 3rd Birthday Toddler Long Sleeve T-Shirt. I'm three cute puppy. Celebrate your toddler's third birthday with this adorable little doggy. Happy 3rd b-day 3-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.