Doctors in Russia have been baffled after treating a baby girl who started showing signs of puberty at just three months old.

Milana, now seven-months-old, has regular periods, her breasts have started forming and she has developed pubic hair.

A source at the Russian Children's Clinical Hospital: 'It is the first case in our experience of a baby going into puberty.

'So far, the world's earliest registered case was for a five years old girl.'

The child is from the south of Russia, where local doctors said the baby was entirely normal at birth.

They initially suspected a tumour was responsible for the mysterious medical condition which first came to light three months after birth.

They recommended chemotherapy, which was refused by the girl's parents, Anna and Yevgeniy Gaspirovich, both 30.

The tumour diagnosis was not confirmed and Olga Bogdanova, Deputy Chief Doctor of Novokubanskaya Central Clinical Hospital, said: 'We could not understand the reason of such an extraordinarily early puberty. We are still at a loss. Perhaps it was an inherited abnormality.'

After the baby was moved to Moscow for treatment, she was found to have five times more adult female hormones than an average grown-up woman.

Doctors now intend to treat her with therapy lasting a dozen years with annual injections aimed at suppressing her hormonal activity.

However, Milana's father, a driver, is worried they will not meet the estimated B£32,000 cost.

First to notice the symptoms was Milana's grandmother Valentina, who said: 'I told my daughter that there is nothing normal in a baby having pubic hair.'

After the baby was moved to Moscow for treatment, she was found to have five times more adult female hormones than an average grown-up woman.

Doctors now intend to treat her with therapy lasting a dozen years with annual injections aimed at suppressing her hormonal activity.

However, Milana's father, a driver, is worried they will not meet the estimated B£32,000 cost.

First to notice the symptoms was Milana's grandmother Valentina, who said: 'I told my daughter that there is nothing normal in a baby having pubic hair.'