Personalized Super Trex 4th Birthday Toddler Long Sleeve T-Shirt. Rawr! A Trex superhero wearing a birthday hat is surrounded by a colorful burst of confetti. Cool 4th birthday gift for your four 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.