I wonder if those routines work best for formula fed babies.
DS doesn't nap for 60-90 minutes each time. He often naps for about 35 minutes, sometimes even less. Lately he's been having a longer nap (1.5-2 hours) in the afternoon, but he is still only napping for short periods earlier in the day.
We are definitely better at recognising sleep cues than we were in the beginning, but it's not always easy to get him sleep, so I've bought the Gentle Sleep Book and would like to see if we can follow the advice. Not sure whether/when to start just yet though as we're going away next week which will probably disrupt DS's sleep. (We've been away with him twice so far and each time his sleep got worse, more night wakings and less daytime sleep
)