Theoretically, 7 weeks old baby should get 15 hours of sleep per day. Your baby still isn't on a very reliable sleep schedule. She may need anywhere from two to four naps to get the 5 to 7 hours of daytime sleeps she needs. She should start to sleep more at night and less during the day at 7 weeks; however, her naps may still be very irregular. Don't let her nap too much during the day, and don't put her down for a nap too close to her bedtime. Doing this will prevent her from feeling wide awake when it's time for her to sleep at night. Hope this will help :)