Felicitations to them!
Seriously, they are in for some really fun times as new parents.
By the way, Fallon's wife, Nancy Juvoven, is 46. News articles don't really make reference to whether Juvoven gave birth to the girl, although Wikipedia does use that phrase. And it really doesn't matter except for one thing that, since going through infertility treatments from ages 37 to 39, really bugs me.
Over-forty celebrity women seem more fecund than the general population. My reproductive endocrinologists (yes, plural) all indicated, either explicitly or implicitly, that if you see a 45+ pregnant woman, she is probably using donor eggs, eggs donated to her for the purpose of in vitro fertilization so the 45+ woman can carry the child and give birth. And donor egg procedures are expensive.
I just wish that just one of these famous ladies would say, "Yes, I used donor eggs, so what?" I mean, sure, it's none of our business whether they did or didn't.
But I think the over-aged high-profile pregnancies without explanation lead the rest of us normal people to think that over-40 healthy pregnancies are easy and not that rare. While not outside the realm of possibilities, they are not easy or common. Bringing a healthy baby to full term using middle aged eggs is, in fact, quite rare. Statistics show that women over 45 have a less than 1% chance of getting pregnant with their own eggs. Google it. The statistic is everywhere.
Infertility is painful. The treatments are arduous, the results uncertain and subject as much to chance as to science. I would applaud a celebrity who acknowledged those facts to the public. I think it would help a lot of suffering people to have it acknowledged by a public figure.
That being said, maybe Nancy Juvoven's and Jimmy Fallon's girl is one of those fluky rare over-40 pregnancies that is the result of no medical intervention. In any event, no matter how she got here, the baby's darned cute and kudos to her soon-to-be-exhausted parents. I'll climb down off of my pet peeve, now, and just gaze at the cute baby pictures. :-)