[EllaC]

If you are squashing them up then yes I think it compromises growth. I did that for years and it pushes excess breast tissue into your armpits too. Plus you need to keep circulation going so if its tight bras that are pushing and flattening your boobs to get that boost look youre not allowing fresh blood and nutrients to the boobs if you want them to grow. Plus you need to keep the lymphatic flow going under you arm pit for detoxing purposes and most of these bras cut and push into that area so the blood cant flow through.
Ps I can look down at my breasts now and the flattest part of them IS the parts that my push up bras flattened to order to push them together. Its a gutting realisation