Personalized Merry Christmas Toddler Long Sleeve T-Shirt. It's the most wonderful time of the year. Merry Christmas and Happy New Year! Santa is on the way, Ho! Ho! Ho! 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.