Oh, didn't see your question, I took so long to reply loll! The actual space they take up is equivalent of a cradle or bassinet, but the hammock mattress is much longer and the way it cradles babies makes it much safer and you can use it for much longer. My eldest DS slept in his Amby until he was 23 months old lol! The spring included with the hammock can hold up to 12kg of weight. When he outgrew it, we added a second spring and that saw him through until he was almost two