I think its fair to say we have all had our share of the "criers"......th e biggest piece of advice I can give you is "know your limits" I have said this before on the forum and will say it a million times...ultimately these are not our kids, we do not have the undying bond that God gives you when you have a child of your own, therefore much easier to hit a threshhold with unrelated children. I do agree that what you do depends on age, but my concern is not so much the age of the child but the point you feel you have hit your limit. You need to make sure you put the child down and walk away if things get too frustrating or the child seems unconsolable. Don't beat yourself up, some infants go through periods of colic and some older kids can have anger issues amoung other things, just know when to walk away for a minute or two and also know when you have to quit all together. And never feel bad about either. this is not an easy job, and every kid is not the perfect fit!