I've always respected your opinion, but you read a study and I read a study and for some reason your study about the importance of Vitamin D always seem to be right, why is that? I can quote the three books I read if you'd like, which I'm sure you have a link to the mice study. To be honest I think across the board it's recognized that flathead syndrome is by laying in one positions for a long time. Here is a wiki link, which you are free to make edits and disagree with them as well.
https://en.wikipedia.org/wiki/Positional_plagiocephaly

Only thing I can say is I'm incorrect about the year it was 1994, which it states "Since the back to sleep campaign came around in 1994, the increase in plagiocephaly has risen by 600%, but has lowered SIDS by 80%."

Of course I live in a tropical place that has sunshine most of the year. My state is called the sunshine state and we have more of a battle with heat than anything else, so we're probably getting plenty of Vitamin D naturally from the sun, so it could be why the dozen or so babies I've seen all have round heads. But 600% increase from the 1994 campaign tells me something that the majority isn't vitamin D. Vitamin D levels haven't changed 600% since 1994, so even though it may have some influence on something else the flathead syndrome is not a vitamin D issue over all.

Hi, I'm 32 weeks pregnant, I was given vitamin D tablets back in November but I never took them. Is it too late to start now? Do you think the baby can still get the benefits from it? Thanks Laura

Absolutely not. The sooner you get vitamin D into your system the better for you and the baby.
Vitamin D3 is BEST from CAPSULES or DROPS rather than tablets.

It's a fat soluble vitamin so it's best absorbed when carried in oil.
The amounts required in South Carolina are set out in this presentation
VITAMIN D REQUIREMENTS DURING PREGNANCY, LACTATION & EARLY CHILDHOOD:
A MOVING TARGET? Carol L. Wagner, M.D. & Bruce W. Hollis, Ph.D.

If you live further north you may well require more.
A 25(OH)D TEST measures the amount that circulating in plasma.
The minimum should be 100nmol/l or 40ng/ml
50ng/ml or 125nmol/l is best for fighting inflammation.
150nmol/l 60ng/ml is when vitamin D is present in human milk.

But the point is you can't expect strong bones in people with calcium magnesium deficiency states. Vitamin D status is declining globally because of the increase in atmospheric pollution. So more vitamin D deficiency more damaged children. I'm not saying the vitamin d deficiency and the consequent low calcium/magnesium status is SOLELY responsible just that the more deficient people there are the more vulnerable people there are around and thus more damage occurs when other risk factors alter.

Changing the sleep position may have some benefits and cause some problems in vulnerable babies. My point is that low vitamin D status increases vulnerability.

You've got to look at the whole scenario and not just concentrate on one solution. Life if complicated and it's almost always a whole set of factors that are involved and thinking there is just one way of dealing with an issue is almost always not the whole story.