Personalized Sweet 16 Birthday Toddler Long Sleeve T-Shirt. It's her Sweet Sixteen B-day! Make her 16th birthday special with this pretty heart design. 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.