It's actually only a particular form of vitamin A called retinol. The vitamin A in most foods is perfectly safe, as it has to go through a LONG metabolic process before it reaches retinol, which is the final product, and can be somewhat toxic in high amounts to your fetus. The only big food source of retinol is liver, so just don't eat too much liver during pregnancy and you'll be fine. :)
I'm on my 3rd and I've not heard this one. I eat then take mine and wad told to drink at least a cup a milk a day. I heard there is certain chesse your not supposed to eat
Probably in excessive amounts. I'm sure milk has a small amount like 2% not 100%. You can't avoid it but stay away from foods with high quantities.