Highly recommend takingcarababies insta and blog! She has a class but you can get by without. My babes sleeps through the night. We have a sleepsack, sound machine, lay down awake. I noticed for our babies that there is like a minimum amount of bottles or ounces they need in a day or they will wake up hungry. But the only time we have issues with wake ups is when people are being too loud or if they are sick.
I've read alot of things that say "no baby is too young for sleep training" but idk if I buy that....i tried to sleep train my baby around 5 months and it was a disaster. Looking back i think too many things were going on (learning to roll, getting stuck). We are trying again now at 6.5 months and it's going better but very slow going,been at it for 2 weeks. My first we sleep trained around 8 months and we were done in 3 days 🙈 I think every baby is different. Can I ask what techniques you're trying, and what's going on developmentally with your baby? Just curious if I have any advice feel like I've tried everything 😆