Personalized Monster Truck 7th Birthday Toddler Long Sleeve T-Shirt. Monster truck 7th birthday! A monster truck drives through the frosting on a cupcake, splashing it around in a giant mess. Cool gift for the birthday kid! 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.