As I new dad of 4 1/2 month old twins, I wouldn't think of going to a nice restaurant at a prime time, let alone at a prime time on a weekend. Because my wife and I love going out to eat and because we want to keep some semblance of our old life along with our new one, we try to go out on Friday and Saturday nights very early (i.e. 5:30 or 6:00 at the latest). We are quick eaters and are out of there by 7:00. We will go to nice-ish places but not 4-star restaurants. And the moment one of the kids starts crying, we do everything we can to stop them from crying. If they continue on for more than, say, 30 seconds, we will pick them up and take them outside to calm them down.

If one of my kids was screaming uncontrollably like this kid and I stayed in the restaurant, I would be terribly embarrassed. If your thing happened to me, I'd have considered going over to that table and suggesting that they might want to take the baby outside for a minute and that might help him. Although it's always easier to say I'd do this than actually do it.