Dd is almost 6 weeks. I didn't do anything with ds, but dd is so unsettled I think partly through overtiredness. I seem unable to catch her early enough.
Several friends have suggested a routine.
They all swear by it, even some who did nothing with dc1 then routine with dc2.
So did you do a routine, was it "her" or baby whisperer or something else. And did it work!