Zander was in his hammock from just under 2 months as I said before & he was transferred to his cot at around 6 months. He could have easily stayed in longer as he still fitted in it fine though. Our problem was that he was waking more than usual (LOL for a boy that didn't sleep through until 18 months!), so we moved him into his cot & he was fine. I figured it was about movement, he had started crawling & wasn't able to move around much in the hammock.