@sodafox Well, there are strategies one can use, such as waiting a few minutes, going in to soothe the child, then slowly extending those periods in between soothing. Establishing a bedtime routine can be extremely helpful too - for example, feeding (while still applicable), reading a book, singing a song, then putting to bed while still awake. Minus the feeding part, this is still a really sweet rhythm to maintain as the kid gets older. Heck, my oldest is 9, and it's still one of her favorite things we do.
It IS still a very rough process. Which is why we practiced from day 1 putting our kids in their own beds. Sure, sleeping with the kid is
easier early on, but if that's what the kid knows from day 1, it's a helluva lot easier than the terror they feel of being left alone for the first few times once they're much more cognizant of the situation.
I had the benefit of being a licensed counselor specializing in couples. I'd worked with lots of folks making the leap to parenting. So we knew the pitfalls of the "easier" solutions when it came to early stage parenting.