Personalized Baby's 1st Birthday Polka Dot Toddler Long Sleeve T-Shirt. Baby's 1st Birthday Toddler Long Sleeve Tee - White has cute baby wearing a polka dot birthday party hat. 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.