Personalized 6th Birthday Penguin Toddler Long Sleeve T-Shirt. 6th Birthday Toddler Long Sleeve Tee - Light Blue party gift has celebration penguin with number 6 and polka dot party hat. 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.