Children born to mothers who have low levels of thyroid hormones during pregnancy tend to do worse in maths in early primary school, a study says.
Dutch researchers tracked 1,196 healthy children from birth to age five, having recorded their mothers’ thyroxine levels at 12 weeks of pregnancy.
They then looked at the children’s test scores for language and arithmetic.
Those born to mothers with low levels of thyroxine were twice as likely to have below average arithmetic scores.
However, the scientists – led by Dr Martijn Finken at the VU University Medical Centre in Amsterdam – said the five-year-olds’ language results were no different.
The maths results were the same even after taking into consideration the child’s family background.
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