IVF: It brings joy to countless families, but as another disturbing study emerges, what is the truth about IVF and birth defects?

It brings joy to countless families, but as another disturbing study emerges, what is the truth about IVF and birth defects | UPDATED: 00:13 GMT, 29 May 2012 'I have always worried that his problems were down to the fertility drug (Clomid),' said Sam Major with her son Callum When Marie Storey and her husband Mark were offered help in their desperate bid to have a baby, they admit that they didn’t ask too many questions.