I monitor kitten health while fostering. Continuous monitoring can be done to establish a baseline. It requires the right mindset, though. I look at the overall picture of a kitten's health while considering changes in status. The "overall health" is the part doctors are missing, because science is systematic (step-by-step) and not systemic (whole system), therefore medicine is systematic too.

(100% of my foster kittens have survived (out of 25) and I specialize in fostering the worst cases.)