Hi C.,
I noticed that you say "regular" milk, but here's something to think about: humans are the only mammals on earth that feed another animals milk to their young. If you think about it, it is sort of strange to feed a human baby cow's milk. Also, many babies (including mine) have an alergy to it. It took me months to recognize, but my daughter was passing very small amounts of blood in with her stool (but enough so that she became anemic), and the doctors told me to stop drinking milk altogether (I'm breast feeding). So anyway, if your son naturally doesn't seem to want cow's milk, I wouldn't force the issue. I also understand that you aren't supposed to give cow's milk to babies until they're at least a year old. So that's my two cents. Hopefully he can get nutrition from brown rice cereal (from health food stores or Whole Foods is best) and other good baby foods like avacados, bananas, butternut squash, etc. I highly recommend a book called "Super Baby Foods". You can read about at: www.superbabyfoods.com - it's got EVERYTHING you need to know in it, and is really great. Good luck with Aiden (I love that name!).
Maria