@andy1993 1-2 was way harder for us, but I blame that on my second being the mother of all velcro babies. In every single way he has been more difficult than my first, and I would even classify them both as easy babies (in that we haven't had any medical problems, they both ate well from the start, they both slept fairly decently right away, etc.) so it's not like we even had it that difficult, and I was still rocked by the transition. However, my youngest is gonna be 2 at the end of June, and overall things have gotten better the last 6 months or so. Once he started walking at right around a year old we started feeling cautiously optimistic, and then definitely the last 6ish months or so I would say it's been consistently "easier". Not easy, but better than it was.
The reasons we found going to 2 hard was that my youngest for the first year would have crawled back up inside me if he could have, and literally no one else would do. All our family commented multiple times about just how clingy he was to me specifically (I don't mean they said this in a mean way either, just it was incredibly obvious and not just to me that he ONLY wanted mum). My daughter was just over 2 when we had him, so that was hard by itself, and my husband was home either working or laid off from pandemic difficulties for basically the first year of his life. I can't imagine if I had been doing the solo thing during the days while my husband was at work.
All this being said, it IS better now, and we do plan on trying for number 3 sometime in the fall despite the challenges we had going from 1-2. I've heard that 2-3 is an easier transition hahahaha hope that's true!