Am I underfeeding my kittens??

Hey y’all. I have 3 kittens who are just at about 5 weeks now, although they seem pretty tiny. My shelter told me to feed them 3/4 can of wet food and 3/4 cup of dry per meal 2x a day TOTAL — meaning only 1/4 can of wet food and 1/4 cup dry per cat each meal. The kittens free feed the dry since they aren’t the biggest fans of the dry food, but I’m worried I’m under feeding the wet food.

They always seem like they have ferocious appetites and I’ve read from other reddit threads that overfeeding a kitten is impossible. The only problem is they are also on a vet formulated diet with FortiFlora because of their (seemingly chronic) diarrhea thus far. I don’t want to over feed them and have them get more sick than they already are!

Yet I am worried for their tiny bodies and that I’m not feeding them enough. Any help?

Here are their weights as of 2 days ago: Catniss: 536g Peeta: 512g Effie: 457g

Kitten tax, per the rules of Reddit lol.