Is your baby gaining well? Having the right number of wet/poopy diapers? I have no idea how much a bf baby gets normally, as I haven't ever measured, but I'd rely on the other indicators to determine if your baby is getting enough milk. Fullness isn't a good indicator of what's going on. Demand = supply, so as your baby needs more milk, he will nurse more often, which is great because your body will respond by making more milk after a day or two.