You will need 3 buttons 3/8” diameter. The pattern asks for 41/2oz baby weight yarn for the small, 5 oz for the larger size. “Lucky the baby who is welcomed to the world with this soft and sweet jacket. The Travelling Leaf pattern stitch which adds delicacy is made with YOs and is easy and fun to do. The jacket has a little collar which adds a dressy look.” (from the pattern introduction).