6 week old baby sleeps 6+ hours at night and then only sips during the day.

As the title says, my newborn (6w) sleeps 6+ hours at night. The dr said no need to wake her after regaining her birth weight which she easily did. During the day, she eats every 1.5-3 hours but only about 4-5 minutes per side, if that. She always comes off on her own, and won’t re latch after that time, no matter what. I burp, change diapers and then offer again but she never relatches. I feel like there is no way that she is getting enough food… I don’t know if this is a growth spurt or what… but I don’t feel like I’m doing a good enough job ebf her. Do I just trust that she is doing okay and that she eats so frequently but little during the day and it’s fine or do I need to be waking her up at night?