Sorry I didn't make it clear when I said a travelling stroller. I meant an umbrella stroller or whatever kind of stroller than is light and is easy to fold. Most airlines make you leave the stroller at the plane's door beore you get on board, and return it to you right there when you get off. Sometimes when the flight is not full, they allow you to carry it on board, which for me is a nuisance. I then would have to look for a place to stow it. I'd rather leave it at the door and get it back at the destination. They won't allow you to use the stroller in-flight anyway. Mind you, on ANA once a flight attendant asked the mother to put her crying baby in the stroller and walked up and down the aisle during the taxying stage after we landed. I found that extremely unsafe.
If it's not a feeding time, I normally keep the water/juice bottle handy for the take-off and landing. I don't know whether it helps, but prevention is better than cure. Noone likes a crying baby on board, especially the mother. But once my son had a cold and his ears must have hurt him. He cried during the last 5 minutes of the flight, and couldn't drink. When it comes to that, I guess you just have to let them cry.