What size round smooth silicone implants do I need to go from a 38 C to a DD/DDD. The implants will be subglandar with a lift.

Hello and thank you for your question.  The
best advice you can receive is from an in-person consultation.  Based on
your photographs, the best shape and contour could be achieved with an implant
and a breast lift.   A breast lift with an implant can result in a very nice shape if
good technique is used.  The size, profile, and shape of the
implant is based on your desired breast size/shape, your chest wall
measurements, and soft tissue quality.  This decision should
be based on a detailed discussion with equal input from both you
and your surgeon.   Make sure you specifically look
at before and after pictures of real patients who have had this surgery
performed by your surgeon and evaluate their results.   The most
important aspect is to find a surgeon you are comfortable with. I recommend
that you seek consultation with a qualified board-certified plastic surgeon who
can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.  FACS
Harvard-trained plastic surgeon

Unless you are very short and very petite framed, an implant anywhere in that size range is not likely to increase someone two to three cup sizes. And....if you are that height/frame, I would suggest you seriously consider submuscular implants to maximize your long term results with breasts that size. If you are tall/wide/sturdy framed, subglandular may be great but I believe a much larger implant would be required.

Try on sizers in your surgeon's office while wearing a tight sports bra.   Your implant size is limited to the amount of skin you have on your chest.  For instance, you cannot put a size 9 foot in a size 6 shoe. It just want work.  Your surgeon will take measurements to determine how much skin and breast tissue you have.  Going really large sometimes needs to be done in stages to allow for the skin to stretch to accommodate a large implant.  Having the implant placed above the muscle is a good idea for a natural look.  Also, if you start to sag a little later down the road, the implant goes with your breast.  If it is placed under the muscle, you could get the appearance of a "double bubble."