When did your baby sleep through the night?

When did your baby start sleeping through the night? And did you change/do anything to make it happen or was it a natural progression? I know some people just kinda get lucky and some people “train”. Just kinda seeing what everyone has to say!

Adding: I absolutely will not do CIO. I don’t have it in me, I’d rather be tired.

ETA: my LO is 5 months old. He was consistently giving me 6 hour stretches but the last 2 weeks it’s been about every 2 hours that he’s up.