How do you know?

I’m genuinely curious about this… How do you know a guy will be a good dad ? I’ve seen so many relationships going to 💩 after having kids because women don’t feel supported enough from their partners, or they stay but complain all the time, like me… I swear there are days we’re I wish I had chosen better but that takes me to think how do you know ? Pets? Maybe but still they’re not as demanding as kids are…