Yup - just tie it super duper tight. I've actually found that if I'm not careful, there is slack in the bits that go around your waist after crossing over at the front. The material will always stretch to accomodate baby. But if you start out tying it really tight.. you'll get the feel of how tight you need it for the size of your bub.

I do find it annoying when tying that my top underneath rides up all the time. LOL. But you do get used to tying it!