How much milk should kits be drinking?

I've looked everywhere for the answer to this question, and in the FAQ's for chinchilla breeding and babies, it says the kits should be consuming 2-3 syringe-fulls of milk, but is that an insulin syringe, or something else? I have a syringe that goes up to 5 ml, and my little Ash will normally drink about half before he loses interest. Is that enough, or should I keep trying to feed him more?



Thanks!