It's unlikely to hinder your boob growth.
If your boobs develop like mine, you may well get two dense lumps about 3 inches in diameter and about an inch thick protruding from your chest consisting of glandular tissue under the softer fatty layer. Aside from regular boob pain of them both being squished up, I find it uncomfortable having these developing lumps pressing hard against my chest and the mattress. I end up either sleeping on my back or side as a result.