Paraphilic infantilism is a desire to be treated like a baby. The lord told me that this is a sexual sin. This sin could bring spiritual harm to my family. The lord told me that I cannot do these kinds of things with my future wive.
Is there a way to overcome this sexual sin?
I'm not a psychologist or anything, and I'm sure there are actual answers to be found for this, that is, people who've been there. Until then, I would not take comments from people who don't understand to heart, including mine. I applaud your courage for simply asking complete strangers for advice, I think that's a good start. Stay anonymous but don't be ashamed, that's my only advice to you I am 100% sure of. You may have to knock on more than one door until you find really solid help, and don't take it to heart that people (ironically) tend to be rather infantile about such things.
My first thought was: what is it you are looking for with this desire? For example, safety maybe? Or is it something you missed out on during childhood? Maybe this is exactly the wrong stuff to ask for some reason, and I don't necessarily am asking for an answer -- it's just that my first intuition is that being treated like a baby is a means to an end which may yet be unknown to you, but an end in itself. What you're looking for is probably not a bad thing, you're just looking for it in a bad place, if you know what I mean? That's all just guessing, and I could say this about a lot of habits and addictions. By all means look for something like self-help groups and serious literature first and foremost, everybody else is probably going to give you more bad advice than good (we can't help it, we have no real clue).