Ontario Breast Implants doctors

You should trust your surgeon.  The difference between 350cc and 400c is around the volume in 1 or 2 shot glasses.  In general most people that have breast augmentation who tell me they want the natural look and insist on a certain volume usually don't realize that what they really want is to have full breasts up top, which is not the natural look.  The natural breast is never full up top unless there is a pushup bra or implant involved.  In general most people are much happier when they error on the side of going bigger.  That being said there is not that much difference between 350cc and 400cc.  

If you go too big you could end up with a problem called synmastia which is lifting of the breast beyond the midline which in the photo that you show is very close to happening.  Complications from breast augmentation are more likely when implants which are too large for the patient are placed.  You should discuss your concerns with your plastic surgeon carefully and listen to what his/her  recommendations are regarding size.   Also cup size varies from depending on the style and brand.  I have seen that some bra brands run 2-3 sizes bigger where a D cup in one brand can be a B cup in another.

I have done breast augmentation procedures on people with physically demanding occupations and they have not had any problems related to the breast implants.