yes its very normal for lots of babies.
around 8-9 months most can wake up a lot, as its a time of major development - maybe your DS is getting there early.

Some nights DS would wake up and just lie in bed talking to himself (or to his toys).
Some nights he still wakes up more than once even now.

Mostly though if my DS had been sleeping through til then, and refused to resettle at all, or did but still worked repeatedly throught the night, i'd get his ears checked and/or make sure he wasn't teething.