Malaysia’s system for tracking repeat domestic abusers is under scrutiny after police said a man accused of assaulting his pregnant wife until she miscarried had been married nine times and was free on bail while appealing a 10-year jail sentence for attacking another spouse who was previously expecting.

The 43-year-old suspect, named in local media as Rosmaini Abd Raof, was remanded for seven days in Kedah on Wednesday after police arrested him at a homestay in Alor Setar, the northern state’s...