My wife's bloodtype is A+. My bloodtype is RH-. My child is O-. Is the child mine?
Can a baby have different blood than it's parents?

Thank you for taking the time to ask your question at AMHD.

To clear something up, RH is not a blood type. Blood types are A, O, B, AB,

RH is your Rhesus factor, meaning you are + or -. Your wife's blood type is A with a positive (+) RH factor.

So, your blood type has to have a letter such as the A, O, B or AB.

In answer to your other question, yes, it is possible that the baby has a blood type other than the parents, rarely, but it's possible. Genetics plays a role.

Finally, without a DNA test, it is impossible for us to say one way or another if this child is or is not yours.

I agree, Blood type alone is not enough to test a child's Paternity, I would advise a DNA test.

Blood type is genetic. To determine paternity you have to go to the cellular level.

Before you go out and accuse your wife of infidelity you really need to know your blood type first. You may be creating a hurricane level problem for no reason.

Has your lady ever given you reason to suspect that the child is not a product of you and your lady's efforts?

What are you going to say to this lady if you are wrong!

you really need to know your blood type first.

Exactly, RH- is not a blood type, but is part of the "blood type makeup."

I worked in laboratories for 30+ years and have seen babies quite commonly have different blood types than their parent.

Each person's blood is one of four major types: A, B, AB, or O. Blood types are determined by the types of antigens on the blood cells. Antigens are proteins on the surface of blood cells that can cause a response from the immune system.

The Rh factor is a type of protein on the surface of red blood cells. Most people (about 85%) are Rh+ (positive) like your wife. The remaining 15% of our population do not have the Rh factor so they are Rh-(negative) like you and your baby. Since your wife is Rh+ (positive), the baby's father has to be Rh-(negative) like you, so that's an encouraging sign.

Relax... It's very possible that the baby is yours, but only a DNA test can tell you with 99%+ certainty.