The first night of my son's life was spent right next to me, in our hospital room, skin-to-skin. We co-slept up until the day my son showed interest in sleeping on his own, about a month or two before he was a year old. While our sleeping arrangement worked best for my family, I can tell you that it made sleep regressions a damn nightmare. Thankfully, I identify as a "lazy mom," and figured out all the ways lazy moms handle sleep regressions. While it was the absolute worst and my partner and I were exhausted and those regressions felt like they'd never end unless I died, I almost guarantee my lazy mom hacks at least made those moments manageable.
Your kid will probably undergo at least six sleep regressions before they turn two years old. They'll have one at 6 weeks, one sometime between 3-4 months, one at 6 months, one between 8-10 weeks, one when they turn a year, one at 18 months and one when they turn two. I mean, you might as well just forget about getting into a steadfast "routine," because the moment you do your kid will regress and it's back to square one (although I do suggest getting in a sleep routine, because it will save you). When a sleep regression hits, the best thing you can do, in my opinion, is be lazy about it. Sure, you can try sleep training, but that requires so much work and when you're already exhausted, I say roll with the punches (or roll over and go back to bed and let someone else handle the punches).
The most important piece of advice this "lazy mom" can give you, is this: take care of yourself. Sleep regressions are hard on your child, yes, but they're hard on you, too. If self-care is considered "lazy," then please, be the laziest mom there ever was. Make sure that you are getting enough rest to stay healthy (both physically and mentally) and if the following things every lazy mom does during a sleep regression can help you achieve that, go forth and be lazy, you sleep-deprived mom, you.