I'm totally stealing this one. Well, let's give a twist, though, since I first learned that news via sonogram months ahead...
True Happiest Memory: the moment I heard her first cry and I cut the umbilical cord...that's pretty unforgettable. She didn't just outrageously loud, painful sort of WAAAH! she had a cry saying, "I'm here, where's the milk?" delicate kind of cry.
Greatest feeling ever for sure!