I really don't think you've got anything to worry about there hon. I remember at that stage and even a little bit older DS was still having 4 sleeps a day, so probably wasn't going for much more than 1.5hours awake time. It wasn't until after 6 months that we got down to 3 naps and then I think about 9 or 10 months till we consistently got down to 2. Even now at 13 months he's still having 2 naps most days.

I really think it is best to go with the flow and follow their tired signs. Especially if they are a cat napper (I think I remember you saying that somewhere else), which my DS was. It's only been in the last couple of months that he will sleep for anymore than 30 mins during the day.