I think every bub is different, and just do what seems to work for them indivdlly!! strange thing is at 6.5 months my DS stoped having his afternoon nap, there was nothing i could do to get him to sleep, he still slept 2 hours in the morning and would then be fine till bed time at 8pm. then all of a sudden at 9 months if i didnt put him to bed at around 3 id walk into the lounge to check on him cos hed gone quiet to find him spralld out in the middle of his toys fast asleep, and hes had 2 sleeps ever since. hes now 11 months!! theyll let you know how much sleep they need, so dont worry bout it too much!!