A lawmaker in the Japan Restoration Party was jeered during a meeting at parliament and told by a male lawmaker she "should give birth to a baby."

The incident took place in April when Rep. Sayuri Uenishi was speaking on Japan's declining population at a committee meeting. It didn't receive attention at the time, but Ms. Uenishi brought it up this week after publicity about a separate case of sexist heckling in June at the Tokyo Metropolitan Assembly, when lawmaker Ayaka Shiomura was told to "hurry up and get...