Personalized 4th Birthday Motorcycle Boys Bear Toddler Long Sleeve T-Shirt. Four year old birthday party design for a little boy with bear riding a motorcycle 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.