Breasts and the size

Julie-Anna • On my journey with baby #2 😍
This may sound odd but I'm wondering if anybody knows of any effective ways to increase breast size. I used to have almost a D cup and now it seems like they're making their way down to a B. I'm honestly not sure how this happened but again, I'm looking for sources. If any of you guys have done anything and it was effective, please let me know.