I've been a bit concerned about routines too. My baby is 9 weeks and I have been going by the feed play sleep routine. I think that because she is healthy and putting on (a lot!) of weight then I must be doing the right thing so i keep doing it.
The only problem I have is with feeding during the night. She wakes every 3 hours (to the minute) at night, although I have her fed and back asleep within half an hour - maybe 45 mins. I wouldnt have thought she'd be sleeping through the night yet, especially considering how hungry she is, but am i wrong? is she meant to be sleeping more through the night?