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The UK's advertising watchdog has said it will ban "gender stereotypes that are likely to cause harm, or serious or widespread offence".

The Committees of Advertising Practice (CAP) said harmful stereotypes in adverts "contribute to how people see themselves and their role in society", and can hold some people back.

The ban will cover men struggling with household chores or girls being less academic than boys.

The rules come into force in June 2019.

The change follows a review of gender stereotyping in adverts by the Advertising Standards Authority (ASA) - the organisation that administers the UK Advertising Codes, written by CAP.

Image copyright Aptamil Image caption An advert for baby formula Aptamil was accused of reinforcing gender stereotypes

The review found that "harmful stereotypes can restrict the choices, aspirations and opportunities of children, young people and adults" and that these stereotypes can be "reinforced by some advertising, which plays a part in unequal gender outcomes".

As a result some people could be held back from "fulfilling their potential, or from aspiring to certain jobs and industries, bringing costs for individuals and the economy", it added.

Ella Smillie, a policy expert at CAP, told the BBC: "There is nothing in our new guidance to suggest that ads can't feature people carrying out gender-typical roles.

"The issue would be if in that depiction it suggested that that's the only option available to that gender and never carried out by someone of another gender.

"So for example if you had a woman doing the cleaning, we wouldn't anticipate a problem. But if you had an advert with a man creating lots of mess and putting his feet up while a woman cleaned up around him, and it was very clear that she was the only person that did that at home, that's the kind of thing that could be a problem."

Image copyright Asda Image caption An Asda Christmas ad - in which a mother was shown doing most of the preparations - also attracted complaints

CAP highlighted other examples that could be "problematic", including:

Situations that depict a man or a woman failing to succeed at something because of their gender, such as a man's inability to change nappies or a woman's inability to park a car

Adverts that belittle a man for carrying out stereotypically "female" tasks

The CAP also said that adverts that emphasised the contrast between a boy's stereotypical personality, for example, being "daring", with a girl's stereotypical personality, for example, being "caring", needed to be "handled with care".

'Inappropriate sexualisation'

Under the new rules, gender stereotypes would not be banned "outright", the committees said, because the evidence did not show that the use of gender stereotypes was always "problematic".

CAP's director Shahriar Coupal, said: "Harmful gender stereotypes have no place in UK advertisements.

"Nearly all advertisers know this, but for those that don't, our new rule calls time on stereotypes that hold back people and society."

The watchdog already has rules in place which ban adverts that include gender stereotypes on grounds of "objectification, inappropriate sexualisation and depiction of unhealthily thin body images".