Sleeping through the night

When do babies normally start sleeping through the night? My LO is 7 weeks old today and he still eats every 2.5-3 hours on the dot. My supervisor makes me feel like I’m doing something wrong because he naps during the day when I’m working remotely but still keeps me up at night. Also would a small amount of cereal in the bottle be a good solution? I know people say that’ll keep him full longer but I’m not sure if he’s too young for it or not.