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25 years
My ex is due end of Jan-beginning of Feb. She had sex with some guy around 3/15-3/28, then only with me in April. She claims he never came inside her & it was only us 2. If it's true, am I the father?
Nov 3, 2014

Dr. Nada Awada Family Medicine
When the child is born they routinely check his blood group in the hospital. Blood groups can help exclude paternity but not prove it. If the child has a different blood group than yours or his mother's, then definitely you couldn't be his father. If the blood group didn't help to exclude paternity then the best method is to do DNA testing. They take cheek swabs with a cotton tip from you, the baby and the mother and they test it. This will give you a definite answer.
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