Personalized 3rd Birthday Look Whos Three Infant Dress. Whether you're planning a big birthday bash or a small family gathering, this 3rd birthday design is sure to bring a smile to everyone's face. Made from high-quality materials, this design is comfortable for kids to wear all day long while they enjoy their special day. Your little one will be adorable and comfortable in this 100% combed ringspun cotton 1x1 baby rib dress!