My 9 month old has never been a great sleeper, not through lack of trying on my part either. She used to settle pretty well at bedtime but I can be up with her anywhere from 3-10 times a night-until recently.
She has started having longer naps, 2x1.5hrs but come bedtime she's started treating that as a nap so it's knocking on 10 when she finally succumbs.
She has a dummy, comforter, white noise, dark room etc. I can't tell if she's needing more or less daytime sleep.
Her wake times between naps are roughly 2.5-3 hours which I think is correct for her age.
I'm sure I remember a poster on here who was fantastic with advice from having my first(who I thought was a crap sleeper) FATE.....