Interesting question and concern. . . hummmm. . .
I really think that if we were to go to genetics, we would find that much milk during pregnancy has no effect over the genes that will have already determined what the upperdermus (sp?) will be. The quality of the skin--the largest organ--will become as it will have been 'programed' to become, and there is very little--as far as I know at the moment--that can be done to affect that.
Once you have your skin make-up and consistency, however, there are some things that can be done to enhance that naturalness and pre-decided smoothness (whatever degree of smoothnes that may be).
Is your wife Japanese? Oriental? Do either of you or your parents have smooth, milky skin? The answers to these questions may help in getting some understanding of what the results may be. I hope it goes in your favor !! MM
OH...and welcome to the forum !! Please do hang around 11