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| Babies cannot create enough of their own own Vitamin D so in Switzerland, they are given supplements. | |
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More simple than that - babies who born vitamin D deficient because their mothers are vitamin D deficient.
With my third pregnancy, I was working mostly indoors (office/computer job) and I made the effort to go outdoors and put my face and hands in the sunshine for 10 minutes each day.
Mothers who are pregnant through the winter have babies with lower vitamin D than mothers who are pregnant in the summer months.
Babies are not generally born with 'good' Vit D levels that dramatically decrease, they either lay down the vitamin during the pregnancy, or they don't.
Breastmilk/Formula/Cow's milk contains low amounts of vitamin D. The best source of Vit D is sunshine. Our bones need Vitamin D to process calcium - no point in having lots of calcium in your diet if you are vitamin D deficient - but if you sort out the Vitamin D, your body can build your bones using the calcium.
There are heaps of nutrients that are laid down / stored in the body during prenatal life (or not)...that become important later...the biggest factor in deficiency will be whether the mother was deficient during the pregnancy - it's very hard to supplement a baby later...
Milk is actually not considered a very high source of vit D - if you are deficient, get some sunlight or drops - although Vit D deficiency can also indicate malabsorption or other problems with digestion/diet.