The B12 vitamin occurs naturally in red meat, fish and dairy products and is already known to help the development of the brain and nervous system in unborn children.
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It also helps prevent dementia, heart disease and even fertility problems later in life.
Now the latest findings by researchers suggest pregnant women who consume only low levels of B12 may have babies whose nervous systems have not fully developed.
They say it means a hormone in the brain which lulls babies to sleep may not be released properly, causing infants to cry for longer periods of the day.
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