my 7 month old baby wakes up many times in night without no obvious reason...she does not sleep continously even for 2 hours despite proper night feeding, convinient room temperature......what could be the reasons?

A. In short, dealing with nighttime disruptions is often simply a part of new parenthood. Most issues related to a baby not sleeping are caused by temporary things like illness, teething, developmental milestones or changes in routine — so the occasional sleep snafu likely isn't anything to worry about.