Dude, newborn stage is when you can get the MOST done. Especially if you hit the sleep training hard and early (warning: depending on your kid's temperament this may mean listening to them cry a ton at night for as much as a week—with ours it was more like 3 nights. Early means 8-12 weeks, later and it'll be harder) and keep them on a sleep/feed schedule (strongly, strongly recommended—if you don't they
will switch their days/nights around and make your life a living hell. This means waking them from naps to feed when it's feeding time, which I know may seem crazy but trust me). Even if you totally screw up the whole sleep thing, they're still only awake like 20-25% of the day. I hate be the bearer of bad news but ages 2-4 are oh so much worse.
If the kid's starting to eagerly take bottles then pulling away screaming it could be reflux. If they're also screaming as if in great pain when placed in certain positions (say, in their crib instead of upright in your arms) it's really bad reflux, and/or it's been going on a while. All three of ours and like 1/2 the other kids in my circle of friends had issues with it. If it's bad and untreated it'll fuck up their esophagus (fixable, but it'll hurt 'em for a while) and make sleep training and feeding both horrible. Happened to our first, didn't know the signs and doctors at first were like "LOL it's fine first time parent, you're just an idiot", cleared up fast (better in like 48 hours, way better inside a week, even better with later ones where they didn't have esophageal damage) once we got meds. Get that shit fixed and feeding/sleep issues will be way easier to manage (they're impossible if you don't).
Newborn stage is way worse for women unless you use formula, of course. They're never more than like an hour from another feeding or pumping, seems like. Even at night.
On the bright side, be aware that to someone with three kids, temporarily only having to care for only one kid for some reason (others with wife, others with parents, whatever) basically feels like having no kids. So freakin' easy. So if you aren't having a good time now... god, don't have more, they're a multiplier on the difficulty. Going from one to two is rough. Two to three's not better. I hear it levels off after that but don't know first hand.
So know that I envy how laughably easy you have it. That should make you feel better, right? :-)
Seriously, the first one's a bit of a shock to the system, which I well remember, and I don't envy you. Good luck! 6m-18m is pretty damn cool provided you get the sleep stuff sorted out before then. So you have that to look forward to. Before they turn into horrible little entropy demons :-(