Babies born by caesarean section are more likely to be autistic or develop ADHD, according to a study of more than 20million children. Research found C-section babies have a 33 per cent higher chance of autism and are 17 per cent more likely to get attention deficit hyperactivity disorder. But scientists are in disagreement about whether the birth actually has anything to do with the disorders, or if both are consequences of deeper issues. In their paper the researchers suggested that not being exposed to bacteria in the vaginal canal or experiencing the natural stress response during a normal birth may affect the brain’s development. Experts not involved in the study, however, said it’s more likely that caesareans are needed because of underlying factors which could themselves be linked to autism. They said there is ‘good evidence’ that C-sections do not directly cause autism and that parents should not be afraid of the procedure. Around a quarter of mothers in the UK give birth by C-section. The procedure is usually used for medical reasons but women can also have one by choice (stock image) Caesarean births have tripled around the world in 30 years, with more than one in five…