Most milk did not have the 400 IU of vitamin D - 1992

And much of it at the time was vitamin D2

PDF is attached at the bottom of this page

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Infant formula 40 to 100 IU of vitamin D per 100K Calories

FDA

Apparently need 100K calories per kg, which is 454 K calories per lb

So, a 10 lb baby getting 4540 K calories of formula would get 182 to 454 IU of vitamin D

Every 2-oz. of Similac Advance contains 60 IU of vitamin D

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See also VitaminDWiki

• Low fat milk provides 2.5 times less vitamin D – May 2016