Dr Papageorghiou reveals when is the earliest that the gender of your baby can be determined.
Aris Papageorghiou, works as a Consultant in Foetal Medicine and Obstetrics at St George's Hospital, London. He has a keen interest in research in foetal development and pre-eclampsia. He also works at Oxford University on a number of large studies and supervises postgraduate students in these areas.
* Info correct at time of filming