I think every baby is probably different and there won’t be a one size solution. We tried everything but the cry it out version where you let them cry for 10 m

I think every baby is probably different and there won’t be a one size solution. We tried everything but the cry it out version where you let them cry for 10 mins then go in, reassure them, leave and repeat was definitely the worst strategy by a mile in our case. What worked for us, and like magic, was stopping planning sleep times and instead planning awake times. E.g. after rising he’ll have 2.5 hours awake, then down for a 1st nap. Then whenever he wakes the clock starts for 3 hours, then down for a nap. 3rd awake pattern… etc. The length of the wake windows extended by 10 mins or so each week but by that point there was a rhythm going and being able to get that far was 90% of the magic.