Personalized Monkey 1st Birthday 1 Year Old Girl Toddler Long Sleeve T-Shirt. Cute Monkey Toddler Long Sleeve Tee - Pink for a 1st birthday has I'm One slogan. Cute gift idea for a one year old girl. 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.