How is she not hungry ?!

Ruby • Mommy to a beautiful babygirl💕

Is it normal for an almost 6 week old baby to sleep thru the whole night ? Around 3am I tried to feed her bcus she seemed hungry n it had already been like 3 hrs since her last feeding but she only drank maybe 1oz it’s now 6:17am n she still isn’t waking up to eat 🤨

Edit: ok wen I finished writing this post she woke up to eat but I still want to know if it’s ok that she sleeps thru the night without eating, TIA