I know a paternity test but aside from that is there any possibility a man could ever find out a child is not his?

I know a paternity test but aside from that is there any possibility a man could ever find out a child is not his?

There are scientific testing options other than "DNA testing", if that's what you are asking.

And of course if the man knows he didn't have sex with the mother within the pertinent time-frame, or if it can be proven he was sterile at the time, those would tend to prove it too.

A DNA test, is about the only way,

My husband and I were seperated at the time I conceived but we did have sex w/ in the time frame. But i was also seeing someone else. Now that im back w/ my husband I would hate for him to find out he's not the father. I know that he would never do a paternity test. So thats why I was curious if there could ever possibly be a situation where he would find out? I really wouldnt want that to happen and its killing me inside.

One situation which has been known to happen is this: the child has a medical condition which requires his or her nearest relative to donate blood, bone marrow, etc. Tests are performed and they happen to indicate that the "father" is not the biological father after all.

You might look into what testing is available. It may be possible, for example, to have a test performed with DNA specimens gathered without your husband's knowledge. You do know, don't you, that these tests are usually done with cheek-swab samples?

Yes there could be many situations where your son's or your husband's medical condition might require testing that could determine that he's not the father.

Certain blood types are incompatible. So just blood typing could tell.

To add to what scottgem said, some eye colors are incompatible. Its not always easy to tell on a baby because eye color changes so much as they get older, but generally speaking, two people with recessive colored eyes (blue for example) don't have brown eyed babies.