It could possibly be mental because it has to do what you believe in but it could also be social because you need your parents and peers/ culture to define who you are and what you choose to be
Yes..................................................................
....usually women will start producing breast milk while she's pregnant... the milk goes and come... if u keep breastfeeding your baby "nonstop" the milk will stay...and keep reproducing...but when you stop breastfeeding the child for good....it goes away until your pregnant again....