High street shops will be told not to sell padded bras and sexually suggestive clothes to children under guidelines to be unveiled on Monday.
The tough new rules coincide with the publication of a Government-commissioned review into the sexualisation of children by Reg Bailey, head of the Mothers' Union.
They reflect public disquiet about the marketing of suggestive clothes and sexual slogans targeted at young children.
Controversial products have included High School Musical-themed underwear with the slogan 'Dive In', Playboy stationery, and crop tops for young girls bearing the slogan 'future porn star'.
Mr Bailey's review, also published on Monday, demands that retailers sign a voluntary code of practice with clear rules on how to sell to children, rather than relying on the good taste of their buyers.
Tesco and Sainsbury's have already signed up to the new deal drawn up by the British Retail Consortium, along with George, the clothing range promoted by Asda.
Major high street stores including Marks & Spencer, Next, John Lewis, Debenhams, Argos and Peacocks have also agreed to comply.
The BRC's guidelines say: 'Slogans and imagery including licensed images and brand marks must be age-appropriate and without undesirable associations or connotations – for example, sexually suggestive, demeaning, derogative or political material