Personalized 3rd Birthday Party Cute Monster Toddler Long Sleeve T-Shirt. Cute monster and balloon for a 3 year old birthday party on a Toddler Long Sleeve Tee - White boys or girls 3rd birthday toddler outfit 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.