Personalized 3rd Birthday She is Fierce Girls 3 Year Old Toddler Long Sleeve T-Shirt. Cute 3 year old girl birthday design with colorful flowers and quote that says and though she be but three she is fierce on a Toddler Long Sleeve Tee - Pink 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.