How much to feed kittens?

I feed them in the morning, and the don't eat it all at once but at like 10:00 at night they start crying but i don't wanna over feed them. They are 9 weeks old. Should i feed them when they want or limit it?

At that age, they need small frequent meals. They should eat as much as they want. If I'm reading this right, you feed them dry only and in the morning only? If so, please try to incorporate as much wet food as possible. Wet food is much better for cats. Please read www.catinfo.org to read why.