Personalized Happy 100th Days Of School Toddler Dress. The Happy 100th Days Of School design features vibrant colors and playful elements that capture the excitement of reaching this important milestone. It's a great way to show off your school spirit and commemorate the hard work and dedication that goes into 100 days of learning. Your little one will be adorable and comfortable in this 100% combed ringspun cotton 1x1 baby rib dress!