How Do You Tell If A Cat Is Producing Milk?

A cat will produce milk upon birthing. If it is not, you will notice kittens crying and not being able to nurse. There are special formulas you can buy and there are tiny bottles you can feed them with. This or an eye dropper. Do not use cows milk as this is too hard for them to digest.  Cows milk is made for a cow which had 3 stomachs in order to digest and can be harmfull to small kittens

The kittens can be a good indicator. Puppies and kittens that are fussing all the time could mean they are hungry or mom's milk is infected. If your cat just gave birth it could be a few days till the milk actually comes in and your queen may just be producing colostrum. The best solution is if you are worried call your vet and explain what's worrying you and give them the specifics and they can tell you if they think you need to get everyone in or if your just being a nervous parent :-).

GENTLE squeeze of a nipple
will induce a show of milk.
Or not.