Mom cat & her kittens

Question
My question is, How can I tell if the mother cat is producing enough milk? She feeds once to two times a day. And how long should they feed for? She's been feeding for over an hour each time. But they still cry quite a bit when she leaves. I think I'm just more frantic than her.

Answer
Anita,

It's difficult for me to tell you what is or isn't normal maternal behaviour since I don't know how old your queen is or how old her kittens are. If you'd be so kind as to send me a more detailed history I'd be more than happy to help you out to the best of my ability. I look forward to helping you soon.