I was in your situation this time last year! A lot can change in a short space of time! In march my 1 year old didn’t sleep at all, by the time the baby was born in June he was sleeping through! I did no sleep training with him, something just changed as he got older! He regressed slightly the first week we brought the baby home but other than that he went back to sleeping well again! If he ever wakes overnight (unwell, teething etc) now I just bring him into bed with me and he settles to sleep straight away and also sleeps through his brother waking up (who has taken his place as the worlds worst sleeper haha)
I am in the same situation! My little boys two, will not sleep unless I’m next to him, everytime I escape his bed he wakes up wish I was joking. He wakes up in the night on a good day, twice At least. I am not a single parents but unfortunate I do everything so I “solo parent” So I 100% get where you are coming with the worry on the next bubba and sleep, I’m not going to lie I’m stressed about it too. I’m here if you want to talk ccc