Australia's health minister has rapped Donald Trump over the knuckles for spreading "worrying" unproven claims on autism.

Flanked by Health Secretary Robert F Kennedy Jr, the US president baselessly linked autism to the use of paracetamol by pregnant women and childhood vaccines.

Health Minister Mark Butler said he was "really worried" the comments would leave more than 200,000 pregnant Australian women unsure or afraid of what to do when they become sick, particularly with fever.

"I don't want pregnant women right now to feel unsure about what to do," he told Nine's Today on Wednesday.

"I don't want women who were pregnant in the past to feel unsure or even guilty about the fact that they took a treatment that was advised to them as being safe."

The Therapeutic Goods Administration o

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