An IVF birth more than doubles the likelihood of a child developing asthma, research has shown.
In the most extreme cases the risk is increased almost five times, according to new study findings.
Children conceived with artificial help are also more likely to wheeze or take anti-asthmatic medicines by the age of five.
Scientists discovered the link after analysing data on 18,818 children from across the UK born between 2000 and 2002.
But they point out that the association may not be causal, and the chances of a child conceived after IVF treatment becoming asthmatic are still slim.