FTM questions

First time mom here! I have a 6 week old. My husband is away for work and has been this entire time. It’s just me and the baby right now. There are so many articles about what he should or shouldn’t be doing by this age. And of course, if he blinks the wrong way, its autism! How do you keep calm? How do you know that you’re doing everything right? My LO was just put on meds for reflux. He seems to be doing ok but now he doesn’t cry, and while most parents would be excited over this, it worries me. He used to cry for me, and now he does not. He will make eye contact but only for a second or two then he looks off into the distance. He was having really bad gas issues in the beginning so we bought a sleeper/swing. He absolutely loves it but it’s like he doesn’t want to be held anymore. He’s not smiling at anyone and doesn’t track. He isn’t blind. He will fixate on bold patterns or bright lights. Anyone one else having any of these issues? Maybe I’m just overthinking?