Hi,
My ds is 5 months this week. Over the last month or so he has stopped taking naps any longer than 45 minutes. He sleeps every 2 hours or so in the day so usually has about 4 naps. He seems happy and healthy to me (a bit snotty at the moment as he has a cold but otherwise cheerful).
Having researched this a bit I have learned all about sleep cycles etc.
Some sleep books say that 45 mins is not enough - that only naps of an hour or longer actually count as restorative. I have noticed that I can easily extend morning naps to 1.5 hours if dd sleeps in the sling; i feel him stir and a quick jiggle and he's off again.
In the pushchair or cot he only ever sleeps for 45 mins. Ds can self settle at night but not in the day.
If your baby was a catnapper - did they grow out of it? Did you use sleep training to extend naps (I am dubious about this as it seems to be going against ds' nature)?
His night time sleep is reasonable, he goes down easily between 6 - 7pm and wakes around 6am, with 2 feeds (ebf) in between.