There are numerous reasons why a couple may have difficulty conceiving a child. Disease, drugs, heredity, lifestyle habits or even exposure to certain toxins can affect fertility. Disease or medical condition such as endometriosis, reproductive tract infections, hormonal imbalances cause diminished reproductive capacity.
In the following video, robotic gynaecology surgeon and fertility specialist Dr Kenneth Leong, talks about medical conditions that can affect pregnancy:
It is generally advisable for a couple who is trying to conceive to meet an infertility specialist. A good place to commence is with your own family practitioner or gynecologist and or for men, your urologist. They will encourage both you and your partner to be evaluated for the common causes of infertility and may arrange initial testing and intervention.