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A latest study debunked the association between vitamin D levels in newborns and the risk of developing multiple sclerosis in adulthood.

This study was conducted by researchers at the Karolinska Institutet. Over the recent years, it was widely accepted that low levels of vitamin D in newborn babies increase the risk of multiple sclerosis (MS) in adulthood. This is based on the studies that highlighted infants born in spring have a high risk of developing the disease as compared to those born during autumn. It was believed that low levels of sun exposure during pregnancy doubles the risk of MS in children born after winter...... Read More - http://www.ms-uk.org/vitaminD

The level of vitamin D at birth or the first year is not so important.
What is important is the vit D level from say the 2nd to the 6th month of pregnancy and the vit D level during the main phase of cellular growth of the adolencent, say at 11/12 years.
When new cells are built, vit D is taken directly from the blood. There is an association with the number of gates on the cells with the vit D in the blood at that particular time.
More gates on the cells implies that the pump will work better and longer before it gets jammed..
We all know the example of the identical twins that get separated before adolecence, the one with much sunshine has less chance of developing MS because his/her cells have more gates/membranes.