This pattern requires the same amount of sock yarn as an adult pair of socks. The size will adjust from newborn to 18 months because of the double rows of YOs for the gathering cord. Folded over = newborn, Top row only = 18 months. The directions are provided for a foot which is easy to unravel so that the leggings can be converted from footed (newborn) to footless (18 months) as your baby grows. I call them Froggie Leggings because I have somehow only made them in green. Naturally they can be made in other colors….that’s just my explanation for the Froggie.