So I don't drink coffee and when I do have any soda I always buy caffiene free. But occasionally when out and about I'll grab a Dr Pepper. Will this make my baby not sleep as well? I read that as long as you keep it under 300 mg a day it shouldn't effect their behavior and even a large Dr Pepper only has upwards of 90 mg in it. I just wondered if it could effect my baby at all. I didn't even think about it until after I had finished one the other day while out to lunch with my sister.