Night time sleeping pattern of 7 weeks old

Hi Mummies, I have a question on the night time sleeping pattern of my 7 weeks old baby boy. As the night time starts, I feed the baby and put him to sleep and he sleeps for a stretch of 4 hrs. After that I feed him again and then he sleeps only for 2.5 hrs and will get up and will be hungry again. Is this a normal pattern ? Sleeping for a stretch of 4 hrs once and then getting up every 2.5 hrs? Any mummies who experienced this? Can please share your experience? #firstbaby