How to tell if your wife's or girlfriend's baby is from another man?

If your having doubts on your wife or girlfriend, the easiest way to determine if the baby is yours or not is through a DNA test.  But if you don't have the budget at your disposal, you may still determine (more or less) if you are the parent through blood typing (though it may not be 100% accurate as there are several outcomes).  It's very simple.  All you have to do is determine your blood type, your your wife's or girlfriend's blood type and the baby's blood type and match to the chart below:


Type O + Type O Type O
Type O + Type A           Type O, A
Type O + Type B Type O, B
Type O + Type AB         Type A, B
Type A + Type A Type O, A
Type A + Type B Type O, A, B, AB
Type B + Type B Type O, B
Type A + Type AB          Type A, B, AB
Type B + Type AB          Type A, B, AB
Type AB + Type AB        Type A, B, AB

A word of advice:  ALWAYS keep an eye on wife or girlfriend to be sure you don't encounter this kind of problem.