Health expert Dr Michael Mosley says there are three things men need to change if they're trying to have a baby - and finding it difficult to conceive. Dr Mosley, writing for MailOnline, explained that a recent major study found a drop in sperm counts.
The research in Human Reproduction Update found men in the Americas, Asia, Africa and Europe had all seen at least a 50 per cent decline in sperm counts. Lower sperm counts make it harder for couples to conceive.
One study predicts that the world's population will start to fall sharply as the number of babies being born drops.
