I've never had a infection but I do lactate regularly and I'm not pregnant and have no children. In fact, I've been lactating since the end of high school. I told my gyno who ordered MRI tests and was told I have a pituitary tumor. Meds help it, but I stopped taking them in college because the side effects prevented me from studying effectively.
I've also worked with children a few years and it had zero affect on the lactation. As far as I know, you'd have to have an extremely close emotional connection to the child and even if you did, lactation as a result is very rare. Otherwise, you'd have to use some sort of external stimulation (like pumping) to lactate outside of physiological/hormonal reasons.
Just wanted you to know that you're not alone out there

But keep an eye on it!