Hi there MrsHealey. My DS is now 10 months. He had colic until about 8 weeks and silent reflux until 4 months. Oh and is (still) breastfed. For the first 3 months he slept in ours arms most of the time and when we put him down he slept in a sleepyhead which I definitely think helped but wasn't the miracle cure that some people believe it to be. Also he hardly ever slept in the sleepyhead in the day. No idea why.
From roughly 3 months we had about a month of him sleeping 4 hour stints in his crib at night (in the sleepyhead). After the weeks of colic and silent reflux induced rage this was heaven! I nursed him to sleep every time he woke but it was pretty easy to transfer him back to the crib at that point. In the day though he was still sleeping in our arms most of the time.
Then at 4 months the dreaded sleep regression hit and all that went out the window! From 4 months to 9 months we had varying degrees of failure and success with trying to get him to sleep alone in his crib. It involved a hell of a lot of singing, patting and shushing! In the day I went through a stage of putting him down in the pram and pushing him back and forth in the kitchen. This was quite successful but annoying. At nighttime we started co sleeping initially in the early hours, but for a while he would only sleep if I was lying right beside him - in the day and at night. Throughout this whole period I nursed him a lot whilst laying down on our bed. He almost always fell asleep when I did this and before he was mobile I would sometimes be able to sneak away. But most of the time I just took the opportunity to have a nap myself!
I was very much against any hardcore sleep training but we did try the pick up, put down method for a few days but then he got sick and i felt like there was no point trying if he was poorly. At 9 months we moved him to his own room and it improved his night time sleep a lot. We would have moved him earlier but he was poorly quite a few times and teething bad, so we didn't feel like it was the right time. Also he was still waking between 4-6 times throughout the night so the thought of having to get up to go and settle him was too much considering how sleep deprived I already was!
Recently over the last week he has started to go for longer stretches at night but has become a nightmare to get down in his cot for naps in the day. I'm pretty sure it's separation anxiety that's causing it. So he's sometimes still sleeping in my arms again for naps. Or in the buggy/car if we're out and about.
Not sure if this is any help. But I suppose what I would say is that they go through so many good and bad stages, you can never be sure that you've cracked it! People always say whatever you try you have to be consistent. And I get why. But we found it very hard because not every day/week is the same. Sometimes they're sick or teething or over tired/stimulated. And sometimes you are too! None of us are machines, which is why I think so many of us end up letting them sleep in our arms and/or co sleep. Because it seems like the most peaceful and loving way. Obviously we all know there are risks doing it this way but that's a different thread.
Good luck with whatever you decide to try! And enjoy the cuddles while you can. xxx