I believe in the first 4 months you do what ever works to get your baby to sleep and feel settled / secure. After 4 months, thats when I started them on a routine, took the dummy away, he learnt to self settle on his own and I converted him from the wrap to the gro bag. I did the same thing with both my boys and they're both great sleepers from 4 months and sleep all night. But in the beginning its hard as they're learning so much and still getting used to day and night etc. Good luck.