You could consider block feeding if there are signs that you have an oversupply. Are there? Going there without other indicators can actually lead to down-regulating your supply so you have the other problem with not enough. Usually, if babies are getting too much it comes out again, copious poos and or vomiting.

Do you have a health professional you can talk to? If you feel something's not right, then go with your gut and follow up with someone. It's hard, because no-one else knows him like you do, so they can only guess and extrapolate from their own experiences.