When you buy your original Suzuki Book, you are also given a CD to listen to and play along. But as a beginner, you are always told to practice slowly. And one way to practice slowly is to play your piece one bar at a time, as well as playing the piece slightly slower than the real beat. The former is easier to do than the latter since CD players don't give you the freedom of slowing down the accompaniment.
One of the things I like about
ViolinLab.com is that the members there are willing to help each other out, and that means recommending sheet music, apps, and programs that can really be useful in your progress as a violin player. A member shared this really awesome program that can help you slow down or speed up the beat of any song you wish to play, which is
Speedshifter by ABRSM.