Reading on the BBC news this lunchtime, research into increase risk of childhood brain cancer. Findings point to an increase in head size having an impact on the chance of a baby developing brain tumours. But like with many things, it requires further research to investigate the findings. Out of 1,010,366 children in the study just 453 were diagnosed with brain cancer. So the stats alone suggest it's a small concern.
It comes on the back of research into why we get brain tumours, (over 300 children are diagnosed each year). This included studies looking at the effects of x-rays during pregnancy, as well as exposure to pesticides, solvents, alcohol, and animal viruses.