What's a good weight for a 3 day old newborn kitten?

Also, how do you check the weight of newborn kittens?

I've been weighing with my kitchen scale. For the kittens I weigh in grams. 

It's not so much their specific weight. . .that can vary depending on how big the mother is, how many kittens in the litter, etc., but that they're gaining steadily. As long as they don't lose weight and gain at least a little every day (skipping one day is OK but not gaining 2 days in a row would mean something is wrong), they're probably doing well. 10 grams a day is a good gain but the exact number isn't the most important part. Yeah, a digital kitchen/mail scale that weighs in grams would be best. You can usually find them for about $20 at Walmart (I found mine in the mailing supplies section). or a kitchen store.

FoxStringzer said:

Also, how do you check the weight of newborn kittens?

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Do it near the mom, so she sees and hears her child, and can observe nothing wrong is done with it.

And do it rather quickly, maximum half a minut apiece...  Respect if the word.

Doing so, you can prob weigh also kittens of a shy AND/OR protective semiferal mom. Of course, with your own home girl it is probably not full so hurry.

At the same time, you do have a quick look see if there are any problems.

As Willowy said, measuring in grammes you can have the additon of 10+ a day as a rule of thumb.  (observe, it is in most healthy kittens often more than 10 a day, but the first day is usually just a small raise)

- This is one of the plusses of measuring in grammes, easy to remember and see, both for you and us advising here.