Is it ok for my 9 week old baby to sleep through the night?

My baby is 9 weeks 2 weeks ago she was going to bed at 9:30 and waking up sometimes after 12 if not then between1-2, then again at 4, and at 6 and just before 8. Then for the last week for the first 3 nights she was drinking her last bottle(4 ounces) at 9:30 so she would be out for the count and asleep between 10-10:30 and wouldn't wake up till 4am then for the following 2 days same thing but she didn't get up until 5:50 and 6am and today same thing but she slept until 6:45am I stopped waking her up every 2-3 hours after the first 4-5 weeks bec she wouldnt want to get up and would fall back asleep leaving almost a full bottle to toss away after 2 hours so I figured if she's hungry she will wake up and let he house know about it and so is it ok at 9 weeks for her to sleep through that long