Children planning major cosmetic surgery will be subject to a three-month cooling off period and must pass an independent mental health check under new national standards.

The Medical Board of Australia will on Monday release new guidelines for doctors performing all cosmetic procedures, from anti-ageing injections to full body makeovers.

They require a seven-day cooling off period for adults before major procedures, and impose a mandatory requirement that doctors prescribing anti-ageing injections and dermal fillers see the patient – at least by video – before doing so.

Joanna Flynn, chairwoman of the medical board, said the public guidelines should send the message that all surgery is serious and requires proper consideration by patients.