Personalized Behind Muggles & Mom Toddler Long Sleeve T-Shirt. Muggles and Mom westie terriers - A behind the scenes look from the making of children's book, "MUGGLES' NEW HOME" by Author & Illustrator, Kim Niles 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.