I often feel bad about giving too much Tylenol, but I try to remind myself that all kids are different. Every time my older one has the slightest temp, we’ve had to dose her aggressively on both Tylenol and advil at the same time, so she won’t have a seizure… sometimes she’s taking the stuff for weeks at a time. I don’t really like the idea of it, especially since they’re so small, but I think “you do what you have to do”. I try to remind myself that there are many adults who take tylenol every day for years for pain relief, that it’s a very safe drug, and that there is little chance of side effects and resistance. I understand your concern though… have you tried something a little more natural like the Hylands tablets? Oh, not sure if that’s an option… I see your son is MSPI.