The Observatory said dozens of barrel bombs were dropped by Syrian military helicopters.
Three women and one member of the White Helmets -- a team of first responders working in some rebel-held areas -- were also among the nine dead, the war monitor said.
All nine civilians were killed in Idlib and Hama, it said.
The regime has intensified air strikes against these areas in recent months, despite a September deal between government ally Russia and rebel backer Turkey that is meant to protect Idlib from a massive regime offensive.
Syria's multi-fronted civil war has killed more than 370,000 people and displaced millions since it began in 2011 with anti-regime protests that sparked a devastating crackdown.
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