[Larkspur]

I always sleep on my right side and I thought that was the cause for my right breast being smaller than my left..

Same! i've heard people say that they thought their right breast was bigger from this though haha. Also that the left side of the body always tends to be slightly bigger and the left breast tends to be the first to develop!

My right grows first i think and is bigger.

I think my right grew first, but my left is a little bigger now (can't really tell since they're different shapes)