Just need to vent

FTM, My 6 week old is feeding every 1.5/2hrs and at night every 3/4hrs ish - my MIL asked me the other week how often she feeds and I told her, and her response was “that’s a lot, you need to get that to every 4hrs” she’s 6 weeks old…. why is she saying this? My baby is gaining weight well, no concerns and consistently has enough wet nappies daily. I know I’m doing everything right but I can hear her voice in my head saying this and it’s really bugging me and making me occasionally get that nag of doubt. 😕