She said this would be "overexposed, unexposed, lots of pointing at the floor, fumbly shots, blurry bits etc".

Compared to children unexposed to antiseizure medications, those exposed to the drug topiramate during pregnancy were 2.5 times more likely to be diagnosed with intellectual disability, which raises their risk to 2.1% by age 12.

"The link between these drugs and children's neurodevelopmental outcomes is there, even if the risk isn't much higher than it is in the unexposed population," said co-lead author Viktor H. Ahlqvist, a postdoctoral researcher at Karolinska Institutet.

Each sheet was wrapped inside Mylar, which not only protected the acid from damaging UV light but also discouraged suspicious parties from opening the package on a whim, potentially destroying unexposed film.

Using modeling, the researchers estimate that exposed children have approximately twice the amount of lead in their blood as unexposed children do.