Personalized 4th Birthday Retro 4 Year Old Toddler Long Sleeve T-Shirt. happy 4th birthday logo with cool retro look and I'm four message 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.