Baby sleeping almost 5 hours straight

I had a sleepy newborn too where he can sleep all the way even when we were out despite noises and hot weather at 2 months, and was very worried. I think it might just be a phase as now that he is 5 months plus, his sleep/nap schedule has become more predictable, though he does sleep a long phrase at night from 7pm-8am still. He is gaining weight steadily and is a healthy baby.