What makes people think one gender is a better fit for a parent?

A lot of people say they could see me with a little girl. Some say they could see me having a little boy. What makes people think one gender is a better fit for a parent? What characteristics does a person have to make them think a girl is better for them? What characteristics does a person have to make them think a boy is better for them?What makes people think one gender is a better fit for a parent?
so many people say this but i think its rude and selfish. i think they are blessed to even have kids.

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