baby sleeping through the night!!

Amanda
My LO is almost 6 weeks old and for the pat 9 days she would take a bottle at 9 pm and not wake up till 3 am and then next at 7! I thought that was amazing until last night a bottle at 9-9:30 and I didn't hear her fuss and I opened my eyes and it was 6 am exactly! Is this ok!?!?!?!? Thanks guys