@wrl
I don't, but supplementation must be safer than in pregnancy.
The concentrations aren't increased to a worrying extent, can elevate the content to 5 mcg/L. An infant might consume up to 1 L a day and the inflated recommended intake for them is 10 mcg/d.
The excessive supplementation to enrich milk with vitamin D may induce deficiencies in the mother, than may manifest in milk.