I would like the opportunity in this thread, to remind everyone that you all were once children and babies. Thus you can pretty much relate if one baby cries or a child cries. Either buy earplugs or buy pacifiers or soothe them with enteraintment, problem solved.
I do not think it is an excuse for anyone on a plane to complain about a crying baby, you can't really ascertain what caused the baby to cry let alone see if the parent does anything to quieten the baby. Manners are of great importance when flying.
Sanosuke!