How would holding onto your child be ignoring the FA? That is what they tell you to do. To hold your child facing you against your chest.
During turbulence, yes, you are told to hold them against your chest, but during a crash situation, you are instructed to place the baby on the floor between your feet. Yes, the baby will almost certainly be seriously injured (if not killed) but to refuse to do so would put
every single person on that plane in danger when the baby becomes a projectile. It's a horrible thing to think about, but it's true.
Why can't this question ever just be answered? Why does everyone have to inject opinions when they weren't asked for? All that was asked is do I need the birth certificate and the answer is yes! If the child is under 2 and flying as a lap baby the answer is yes they will ask for it, especially South West.
The question
was answered in the second post, but this is a discussion board and people are free to give their opinions. If you're looking for a simple answer without discussion, there are better places to look, such as the airline's website.
But, to answer the question: People make the assumption that the airline wouldn't allow lap babies if it weren't completely safe. That simply isn't true. It's probably safe. The odds are very, very good that everything will be fine, but the same could be said about holding your child on your lap in a car. I can't imagine that anybody here would defend someone who wanted to do that.
Honestly, it doesn't matter to me if someone wants to take a lap baby or not. Everyone has to look at the odds and decide for themselves. But I do think that people should make informed decisions - and that requires looking at all sides of the issue, not just the things that make you feel good about your choice.