I spent the first 8-9 months of DDs life trying to fit her into a routine and all it did was stress me out and make me watch the clock all day. As soon as someone said to me 'the babies don't read the baby books do they?' it all clicked and I just started going by DDs cues. Some days was 3 hourly feeds sometimes 5 hourly, 1,2,3 day naps, whatever, I just went with the flow and it was so much better than thinking 'she SHOULD be sleeping/feeding now'.
Both her and I were (and still are) alot happier going by demand!