MISCARRIAGE is generally the death of an unborn baby in the first 24 weeks – approximately six months – of pregnancy.
Miscarriages may not be spoken about a lot but they are very common. Baby loss charity Tommy's estimates there are at least 250,000 per year in the UK and that one in every five pregnancies ends in miscarriage.
It may not be clear why a miscarriage happens but they are rarely caused by anything done by the mother or father. Usually the embryo has a random genetic defect that means it cannot develop properly.
Most women can go on to successfully have healthy babies in the future.
The NHS says most miscarriages cannot be prevented but avoiding smoking, alcohol and drugs while pregnant can reduce the risk.
Some of the other most common reasons for a pregnancy to fail in the first 24 weeks are ectopic pregnancy and molar pregnancy.
Ectopic pregnancy is where a fertilised egg implants somewhere outside of the womb, usually in a fallopian tube. It cannot survive and grow there so either dies naturally or must be terminated.
Molar pregnancy is rarer but happens when a fertilised egg and/or placenta does not develop properly at the start of a pregnancy. There is no single reason why it happens and cannot be prevented, though it may be more common in very young or old mothers.
A baby who dies after 24 weeks is considered a stillbirth.
Source: NHS