Started with A cup, 355MP round implants - Is this symmastia? (Photos)

The photos you submitted demonstrate what appears to be potential symmastia. At six months post op if the implant hasn't fully dropped it is not likely to do so on its own. I encourage you to discuss your concerns with your surgeon.

You are early in the healing phase and do still have swelling. You can keep gauze between the breasts when you push your implants inward. Once settled, I suspect you will be fine.

It appears that symmastia has begun, and wearing push-up bras that bring both breasts together may worsen the condition and alter the shape of the breasts. To avoid this, it's recommended to wear a wire bra with a wire that is wide enough to prevent both breasts from coming together. Additionally, it's important to try to separate both implants as much as possible without causing them to touch.