8 week old not sleeping anymore?

Between 6 and 8 weeks my daughter was starting to sleep at night in stretches of 4-6 hours at a time. Now that she is 8 weeks, she's been waking up every 2 hours to feed. This wouldn't be so bad, but she naps terribly during the day (maybe 45 minutes at a time) and I have a 3 year old to take care of, too. Any encouragement? Could this sleep change be temporary? So tired... 😴