A 34-year-old heavily pregnant woman is in a stable condition in Royal Perth Hospital after her car hit a tree near Bunbury overnight.
The condition of the unborn baby is not known.
The woman was airlifted to Royal Perth Hospital at 10.42pm last night.
A 32-year-old male passenger dislocated his shoulder and a 14-month-old boy was bruised in the crash which happened just after 7pm on Old Coast Road near Marriott Road 20km north of Bunbury.
In a a separate incident, a woman is in a serious but stable condition in Royal Perth Hospital after a vehicle rollover in Regans Ford yesterday.
Emergency rescue crew were called to the scene of the crash on Brand Highway at 4.25pm.
The woman arrived at Royal Perth at 6.22pm.