When a child won't stop crying:

England: If they really don't stop, and it's for no reason or something ridiculous, just buy some earmuffs, make some tea, and ignore them, they'll learn to stop eventually.

Prussia: Hug them until they stop, that's what I would do. Don't look at me like that! I'm not soft hearted! It's just a last resort!

China: Yell at them and threaten to take away their favorite toy or something. They'll hate you for a while, but they'll shut up, so if you value your hearing, that's a price you'll have to pay.

France: Teach them that's it wrong to do, let them grow up with manners to become little angels!

Scotland: Set your dragons after them. (@biiiiiiiiiish has inspired me with this one-)

When a child won't eat their food:

England: You may want to make sure the food isn't burnt, or has sugar instead of salt, or visa versa. I'm only saying that because it's a possibility, obviously, not because it happened with me.

Prussia: Try a few different suggestions, maybe? Or you know, turn it into a game.

China: Tell them that's the only food they're getting. Even if they don't listen now, they'll come back later.

France: It would never happen if you have gourmet food!

Scotland: Let them starve.

When a child won't sleep:

England: Make up some story about some monster that would get them if they don't sleep.

Prussia: Sleep with them.

China: Sleep? I don't think I know what you're talking about.

France: Explain to them the concept of beauty sleep!

Scotland: Let them have sleep deprivation so they never do it again.

When a child won't stop nagging on you:

England: Tell them no firmly. They're stubborn, but you should be more so. If they really, really, won't stop for the world, ground them so they learn not to do it.

Prussia: Aw, give them what they want!

China: Ignore them. It's more difficult than it sounds, but you'll get used to it eventually.

France: Distract them with something fabulous, such as yourself!

Scotland: Drink and forget.

....

Well, that's all for today folks