Just as human breastmilk is meant for infants, cow’s milk is meant for baby cows.  On dairy farms, cows are artificially inseminated then separated from their calves pretty much right after giving birth.  Then, the farmer steals her milk.  Why it’s considered “healthy” to drink cows milk, I’ll never know.  Check out this awesome post (super informative!) for more information on why cows milk is not so good for humans after all.