New born sleep schedule

Can somebody help get my new born on a sleep schedule. I am losing myself and I am losing sleep. Hubby isn't home due to work so with two kids I'm I am struggling. Please help get this little one on a sleep schedule. She always wakes up in the middle of the night 1200-100am, 400am, and 600am. Those are the times she always wakes up. 600 is not a problem and not really so much of 400 but 1200 and 100 is a problem.