Would round silicone implant 375 cc dual plane be the best option for me? (Photo)

yours is a typical situation after pregnancies and breastfeeding. Breasts lose upper pole fullness, look saggy and feel softer. Since your sag ( ptosis) is not very severe, breast implants alone, without lift can give you a pleasing result. In this scenatio high profile implant of larger size as recommended by your plasticsurgeons work very well to take up the slack of lower pole. Duel plane or subglandular placement is best for natural results in saggy breasts like yours and submuscular approach is not advisable.

Thank you for the question and pictures. Based on your photographs, I think that you are starting at a good place should have a nice outcome with breast augmentation surgery. Ultimately, careful communication of your goals (in my practice I prefer the use of goal pictures, direct examination/communication in front of a full-length mirror, and computer imaging) will be critical.

Generally speaking, the best online advice I can give to ladies who are considering breast augmentation surgery ( regarding breast implant size/profile selection) is:

1. Concentrate on choosing your plastic surgeon carefully. Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work. 
2. Have a full discussion and communication regarding your desired goals with your plastic surgeon. This communication will be critical in determining breast implant size/type/profile will most likely help achieve your goals.
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. For example, I have found that the use of words such as “natural” or "DD cup” or "younger looking breasts" etc means different things to different people and therefore prove unhelpful.
Also, as you know, cup size varies depending on him who makes the bra; therefore, discussing desired cup size may also be inaccurate. Again, the use of computer imaging has been very helpful during the communication process, in our practice.
3. Once you feel you have communicated your goals clearly, allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals. Again, in my practice, this decision is usually made during surgery, after the use of temporary intraoperative sizers.
I hope this (and the attached link, dedicated to breast augmentation surgery concerns) helps. Best wishes for an outcome that you will be very pleased with.

It is very challenging to help you decide exactly what you should do.  I know it is challenging for you too.Photos may tell a thousand words but they don't tell the whole story.  Your surgeon had the ability to examine your breasts in person, take measurements, see how they move and see them from multiple angles.  We cannot do the same thing with one photo.From the little information we have, it sounds as if the plan is appropriate.  If you are really questioning your choices, discuss it again with your surgeon or seek a second opinion with an in office visit.  Keep in mind that the second opinion may be different without one being right and one being wrong.  There are many approaches that may give you the results you desire.Good luck to you.  I hope you can attain your goals of photo #2!