Ultimate cluck

Throwaway account just to be safe. My wife and I had been trying for a baby for the better part of 3.5 years. Our age plays as we started in our late 30s early 40s. I have low sperm count so getting pregnant would be hard but not impossible. We managed to get pregnant and gave birth to wonderful baby girl.

After a few months I noticed my daughter has absolutely zero features from me. We joked that she took all her features from her mother and she's her little clone. For reference I'm Latino with dark features and my wife is white with blue eyes. Our baby is paler than she is with green eyes.

I got a little suspicious when I noticed a cleft chin which doesn't run in either of our families. The doubt just kept growing so I did a paternity test and turns out I'm not her father. I have no idea or even a suspicion of who it could be and have no interest in finding out. I love this little girl. She's everything I hoped and dreamed of in a child. I don't care how she got here. I just care that she's in my life. She'll call me dad, I'll be there every step of the way, I'll walk her down the aisle.

I'm not telling anyone I'm not her bio dad. If my wife ever decides to come clean I won't ask any questions. I have everything that I need in my life right now and I plan on keeping it that way.

Edit: I've read through most of the replies here. Honestly wasn't expecting any replies so I'll answer some more of the common questions I've seen.

1. No chance it's not hers. I was in the room during the C-section and after they handed her to me she never left my sight. I also had the fear they would somehow switch the baby so whenever a nurse needed to take her for tests I would accompany. 100% this is the same kid that came out of her.

2. After reading some replies I agree that the priority should be finding out any genetic history she might be subject to. So I'll be bringing things up with my wife and let whatever the fallout is happen.

3. Since my name is on the birth certificate I assumed responsibility for the child regardless of if she's mine or not. Had no doubts when she was born.

UPDATE: I talked to my wife this morning. She was adamant that this kid is mine. She insists that she's never cheated or had a desire to. She'd have been happy being childless with me. Showed her the paternity test and her story didn't change. She says we're going to do another one because there is zero chance that this child isnt mine. Honestly I was not expecting that response. So I'm calling the bluff and we're getting another one done. I'll update in a few days if anybody cares.