Baby falling asleep on own?

Le

Did your baby(ies) learn to fall asleep on their own eventually or was that something you had to teach them through some sort of sleep training method? My 4 month old EBF baby is starting to get 5-7 hour stretches at night without any training on my part, so I’m just wondering if he will eventually teach himself how to go to sleep on his own when I place him in his crib (my ped recommended putting him down drowsy but awake as a newborn but I didn’t listen and he’s no longer swaddled). So now to go to sleep for naps I either nurse, rock, or hold him and then put him down once he’s in deep sleep.