Smog, smoke and fumes could be leaving babies in the womb vulnerable to developing cerebral palsy, according to a team of North America-based doctors and scientists. Writing in medical journal JAMA Network Open, the Harvard University-led researchers said inhaling certain fine particles was associated with an “increased risk” of the condition, which is the commonest cause of infant disability and which is found in between 1 and 4 live births per 1,000, depending on the location. The particles were described as “PM2.5”, where PM refers to ‘particulate matter’ and the number to the size of parti…