I Told My Wife Not To Kiss My 6 Months Son On The Mouth, Could I Be Wrong?

My wife is fond of kissing my 6months boy in the mouth. I personally don’t like this and I have told her to stop it but she refused.

This issue in causing a serious argument in my home and I want to take serious action since she has refused to stop it.

Please, I need advice from experienced parents.

I was abused sexually as a child by a cousin staying with us and there are cases of incest around me. I don’t want any of this to happen to my son.

The teenage girl staying with us always sees my wife kissing my son in the mouth and I am afraid she might copy it and start doing it.

Please, am I wrong? Am I overreacting? Is it normal practice?

Please Advise Me.