I was on Breathine from 24 weeks to 36 weeks. All the doctors that I spoke to said there was little to no long term effects on the baby. It made me incredibly jittery and I felt miserable. BUT it was all worth it because I had a healthy boy at 37 weeks(they had to induce-go figure). My husband had also done a lot of research and all his info came up with that the benefits outweighed having a baby at 24 weeks. I am happy to report that my son is 3 years old and is a normal child in every way(a little active-but normal). I wish you the best of luck. I know this is a very hard time but do what your doctors tell you-no matter how hard it is to stay on a couch for 13 weeks.