"Research has shown that babies born in May - who developed in the womb during the Vitamin D-scarce winter months - are the most likely to get MS in later life, while those born in November are at much lower risk.
Another study this year found evidence that Vitamin D deficiency during pregnancy and infancy could increase a child's risk of developing MS in later life. The researchers concluded that taking Vitamin D supplements during these times could reduce the risk, although this has yet to be proven"
My mother was born in May in the year of the Great Depression, 1929. Her mother told us the story many times that she had to rely on charity to get milk for my mother as an infant. I never thought to ask questions of my grandmother while she was alive that could shed light on her own vitamin D intake during the pregnancy with my mother.
My mother had some symptoms of Sjogren's but not enough for a diagnosis. She had lots of pain from arthritis too. I am 100% certain my mother fed herself during pregnancy with my brother and I as according to the book as she did the years after we were born.
There probably is a vitamin D deficiency in that story but not in the sequence suggested by studies so far.