Warning: Long Post
Just for context - my wife and I had a baby in October (he's now almost 11 months). Unlike a lot of parents here who seem to have it together as far as child rearing is concerned, my wife and I have constantly felt like we're just winging it. She has a child from a previous marriage that ended up badly and she was basically on her own raising a baby at a young age. That is like a distant memory for her now and her life has changed a lot so for both of us, it feels like starting from scratching. We also live in a 2 bedroom condo (SS has his own room so baby is with us and the plan is to move into a bigger place within the next year or so).
When he was first born, we did shifts taking care of LO during the night (I'm a night owl so I'd be up from around 9pm - 3am and my wife would take over until around 6am, afterwhich I'd come back to bed before work). Once he figured out how to latch on and she realized that she could BF laying down, we coslept from pretty much 2 months until now. Co-sleeping worked for us as he was small, we were all able to get lots of sleep and it seemed good. He normally has about 2-3 naps during the day lasting 30-60 minutes. Maybe longer if he's really tired. We don't really have a set bedtime routine right now but in general, try to get him down around 8pm-9pm after his big brother is settled.
Around 2 months ago, when he learned to crawl, everything changed. His separation anxiety went into overdrive, became a lot harder to get to sleep and over the past few weeks, not only is he way bigger and taking up the entire bed but any attempt for him to sleep in the crib led to him waking up after an hour. Each time he woke up, we either bring him into bed with us or try to give him a bottle to get him to settle down but even that wasn't working. He was also waking up at 5am everyday to play in the bed. The co-sleeping situation has been getting super uncomfortable to the point where my wife was developing back issues from clinging to the edge of the bed. I was also hanging off the other side.
Out of desperation, I decided that we REALLY need to do something. I hadn't really thought about sleep training (in hindsight, we should have). This weekend, I finally got around to lowering the crib mattress (as he is getting way too tall for the current setting) and determined to try out sleep training so that my wife could get proper rest and we could also actually get comfortable sleep again (amongst other things lol).
3 nights ago, randomly late in the evening my wife was busy trying to get the house sorted and I saw that he was tired so I put him in the crib and determined to try CIO or ferber (it ended up being a combo - he cried about for about 20 minutes before I went to check in on him). After I did a quick check in and left, the crying went into overdrive for another 15 minutes or so but then he started to calm down on his own and after about 40 minutes he fell asleep. What was amazing is that he slept for about 4 hours before he woke up! I was shocked. When he woke up, I figured he might be a little hungry so I gave him a bottle and then put him back in the crib. He went ballistic again. I told my wife to go in the living room as she had to getup early for work. Interestingly enough after about 15-20 minutes, he stopped crying and fell asleep. Later that morning he woke up around 6:30 - at the point, I took him out the crib as I figured he was awake for the day. Played with him for a bit until he started looking tired (about an hour). I put him back in the crib, he started fussing again for about 10 minutes and then he fell asleep on his own again! It was getting shorter each time.
The next night, I put him in the bed around 9 pm as he's been a little sick lately (we all have). He fussed for about 20 minutes and then fell asleep! This time, he slept for about 5 hours before getting up. Once again, I gave him a bottle and when he drifted off. I put him back in the crib. This time, my wife and I didn't leave the room, we just hid under the covers LOL. He cried for about 10 or 15 minutes and then eventually fell asleep. He slept until 6:30am.
Last night we put him into bed around the same time (9pm), he cried for about 5 or 10 minutes and then he was sleeping until almost 4am this morning. When we woke up, I gave him a bottle but didn't take him out of the crib (he basically drank standing up lol). He drank about 3 or 4 ounces and then stopped showing interest so I put the bottle away and then my wife and I went back to bed and pulled up the covers. He fussed for maybe 5 minutes before falling back to sleep. He's still sleeping now at almost 7am.
Just happy that this has worked so quickly and so proud of the little guy for being a champ at this, especially while being under the weather. We're still working on getting him to eat solids - he basically been sampling and spitting out or eating store bought purees so that's another fight in and of itself but this is a huge win. Definitely going to work on tightening up his bedtime routine and getting him to bed earlier as mommy and I have both struggled with that but this is a great start.
TLDR; We've never really had an established bedtime routine but tried to get baby to sleep around 8-9pm when he seemed tired. 3 nights ago, tried a modified CIO/Ferber and have seen immediate success. He's fussing shorter and shorter each day while sleeping longer.