Personalized 100 Days Of School 100 Days Of Cool Toddler Dress. Show off your child's achievement with this adorable 100 Days Of School 100 Days Of Cool design apparel. Perfect for celebrating the milestone of completing 100 days of school, this cute and happy design is sure to bring a smile to anyone's face. Your little one will be adorable and comfortable in this 100% combed ringspun cotton 1x1 baby rib dress!