"Early miscarriages usually happen because the embryo is not developing as it should. Chromosome problems are thought to be the most common cause. These problems usually happen for no reason and are unlikely to happen again. To develop properly, a baby needs the right number of normal chromosomes. He’ll need 23 from his mum and 23 from his dad. Chromosomal abnormalities can prevent a baby from developing. These abnormalities may happen because there are too many chromosomes or not enough chromosomes, or because there are changes to a chromosome’s structure. In that case, the pregnancy will come to an end at the embryo stage. It’s thought that up to 95 per cent of pregnancies with chromosomal abnormalities end in miscarriage."