Five week old kittens and wet food

We are fostering 5 kittens and Mom, and I introduced the kittens to wet food a couple of days ago. But how often should I feed them, and how much? Between the 5 of them they can eat a half of a can of wet food is that too much?

My five week old kitten eats around every 3-4 hours depending on how active he is. He's really little for his age tho so he eats a little more

I also should of mentioned they are still nursing on mom

I feed my foster babies 4x a day with wet food, and they always have access to dry and water though both of those they tend to make toys out of instead...I feed them till they walk away, than they usually play for a bit and than snooze and wake up about 4 hrs later.