As for Leia's birth, don't forget that just after she has given birth to Leia, the scene cuts away to Anakin turning into Vader. That's at least a 20 second chunk where we don't know what happens between Leia and Padme. I'm sure she talked to her, but I'm clueless as to why Lucas decided not to show it. Actually, I'm not. It's probably because Luke is the most important of them and because it would probably be repetive to have her talk to both babies. So, she talked to her, but we don't see it. Works good enough for me.