Praised for a perfect fit on the heel. The lacets ensure the booties stay on tiny babyfeet. Works well for ALL SEASONS! Baby feet can feel cold. It�s the last body parts together with the hands to get a good blood supply. It can take up to 3 months for the circulation to adapt completely to life outside the womb. So warm the feet of your babies, even in spring and summer. � 0-9 months (9,5 cm)(fits from 0-12 months)