Personalized 1st Monster Halloween Toddler Long Sleeve T-Shirt. Happy 1st Halloween. Frankenstein's monster joins a cute ghost and bat to celebrate baby's first Halloween! 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.