J.R.
My godson's mother experienced spontaneous lactation even before she became pregnant. When she went to the doctor she found out she has a small benign tumor at the base of her skull which affects the pituitary gland (?) which in turn creates hormonal imbalances. She now takes medication and they watch it closely. Since you've recently had a child, maybe it's an hormonal imbalance due to the pregnancy. Sounds like something I'd be sure to talk to my doctor about. Good luck.