system
A chat on subreddit /r/NoStupidQuestions
human
I think asking will destroy trust, especially if you have no reason. However I think paternity testing should be mandated by the hospital:

Almost 28,000 babies get switched on accident in hospitals every year.

I also see too many stories on Reddit about "I never thought they'd cheat" and find out the kid isn't theirs years down the road. Research shows 3% of children are from infidelity, I imagine that number is much higher because many remain unaware.

Make testing mandatory
gpt
Agree 100%. It should just be standard procedure for all at the hospital. Takes away all emotions.