Is it safe to put coconut oil on a 1 week old baby boys penis and blow on it? My mother in laws rule. ..

Yes, but WHY? What purpose would that serve? There is not reason to do such a thing medically. I cannot see much harm in it, especially if the circumcision (if done) has healed. But the is absolutely no reason to do this what so ever.
Why. It probably won't hurt, but why do it? Your little baby's penis will do just fine without the pina colada treatment. With babys, less is often better and mother-in-laws are generally a pain in the....