It is the 21st century solution for new mothers desperate to look their best for a party or wedding. Injections of Botox into the bust tighten sagging cleavage, giving it back its pre-pregnancy perk, the Daily Mail writes.

With the treatment taking just half an hour, it is proving popular with busy young mothers who don't have time to go under the knife. But at 1,000 £ a session, doctors say it is best used as a one-off confidence-booster ahead of a special occasion, rather than as a regular treatment.

Sach Mohan, a surgeon with cosmetic surgery chain Transform, said: 'A young woman who has recently been pregnant might not have very much in her wardrobe that fits. But she is under pressure to look good just weeks after giving birth.This is another tool in their armoury.'

Dr Mohan recommends new mothers wait for at least three months after giving birth before signing up for 'Breastox', as it has been dubbed. An anaesthetic cream is used to numb the pain and the patient is given around 12 injections of Botox into the pectoralis minor chest muscle. The freezing of this muscle causes other muscles in the back to strengthen, and the bust to lift. Wrinkles, caused by ageing, or just too much sun, are also smoothed.  But the technique has its limits - breasts are not made fuller.

Gwen Davies, Transform's head of non-surgical treatments, said: 'Wrinkles on the chest area are very ageing and a dead giveaway to a lady's age, and sun-worshippers are most likely to suffer deeper set wrinkles. Sun damage rapidly ages the skin, leaving it wrinkly and saggy and unfortunately, while many women are cottoning on to wearing sun cream to protect their faces, they're not paying the same attention to their chests.  Botox is now an accepted form of anti-ageing for the face, but our practitioners are constantly researching new ways it can be used to create a more youthful look on other parts of the body.'  

The technique is most suited to women in their 20s and 30s with A and B cup breasts. The Botox takes around two weeks to take effect and last four around three months.