A BABY girl grew a ‘micropenis’ after lying on her dad’s chest that was covered in a hormone gel. One expert says the bizarre case should serve as a warning to all parents.

The case-described by Swedish medics saw a girl grow a 'micropenis' which doctors eventually pinned down to a drug increasingly being marketed to men in the UK and US.

The letters, many of which were already available online, detail why the regulators initially declined to approve some drugs.

Symptoms can vary but typically include fatigue, reduced muscle mass, reduced sex drive or erectile dysfunction.