Medium to advances skills. You need yarn (Marks & Katten Eco Babyull, Sport, 5 ply, 12 wpi. from 200-300 gram depending on size, 574-984 meters or 630-1080 yards), needles (4 mm/US 6) and 4 buttons. Knitted both in the round and back and forth. Four sizes: 6-9 months, 1 year, 2 years and 3-4 years.