Identical Twin questions 👯‍♀️👯‍♂️

I’ve always wondered how parents with identical twins tell them apart, do they look obviously different to you? How do you tell baby A apart from baby B in your belly. How do you set the names or just whichever comes out first you give the first name you picked? I always think about the episode on Full house where Jessie mixes his Boys up and has to do the footprints to tell them apart? Obviously I’m not a mother of twins nor will I ever be. But I’m so curious 😂 I probably sound super dumb