The Rookie Premium is optimised for wearing on the chest. When worn on the back, the shoulder straps would cross on your chest. The Rookie Revolution is ideal for wearing on the back.
You can use the Rookie Premium from a birth weight of 3.5 kg to 15 kg. Use the newborn function only up to approx. 4 kg.
Which Baby Carrier is the Right one for me?
Are you not sure which Rookie carrier is the right one for you? Then read here about the difference between the Rookie Konnekt, Premium and Revolution