Sleeping through the night

My son is 7 weeks and usually wakes up in the night around 2-4 to eat. He woke up at 330, I started to warm his bottle and let the dogs out, then went in to change him and he’s back to sleep already. He’s still sleeping at 4:20. At what point do babies usually put themselves back to sleep and sleep longer in the night?? I usually get him after he starts fussing around but maybe I should let him fuss around a bit longer next time and see if he goes back to sleep maybe? He wasn’t crying, just moving around n making noise.