My baby was four weeks early and very small. His moses basket swamped him and he wouldn't settle. The Sleepyhead was wonderful and he took to it right away. We placed it in his big cot and used that until he was big enough to use the cot without it. Word of warning though, it says you can use up to 8 months but my baby outgrew it by 4 months and is an average size on the growth chart.