7 months baby sleep: bedtime time
I think it all depends on his/her biological clocks. However, a too-late bedtime may lead to difficulty getting asleep, less sleep overall, waking at night and early in the morning. Normal hours of sleep for a 7 months old baby is 14-15. So if she takes three naps around 9, 12, and 3, the bedtime time could be around 7-8p.m
This schedule didn't work for my son. He took 2 naps: at 11 and 3, and he went to bed around 9.30 p.m after a bath.