One woman, who had to change seats because of two mothers with prams, reportedly began complaining about how much she hates kids.

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On hearing her rant, a pregnant woman then turned around to defend the two mothers and their children, telling the woman she should ‘shut the f**k up’ before someone punches her in the face.

But not to be silenced, the child-hating passenger replies: 'You know what will happen? You’ll probably lose the baby.’

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‘Are you threatening me?’ the pregnant woman responds.

The argument continued for over 20 minutes, with other passengers joining in to assist the pregnant woman. Another passenger started filming the altercation after it had already begun.

The incident occurred just outside of Brisbane, Australia, with locals reacting angrily to the footage, which was shown by 9 news.