High Profile 300cc Breast Implants for Someone with 29A Cups?

This sounds roughly accurate for your body type but I would try sizers to confirm the appearance in  clothing

There are several variables in determining implant size.  When recommending implant size for my patients, I consider the followings: 1) patients' anatomy (height, weight, chest width, chest height, amount of breast tissue) and 2) patients' desired look/goal.  Without knowing your chest measurement and breast tissue amount, I cannot give you any recommendation.  You should visit with board-certified plastic surgeon who will examine you.  Try implant sizers to get a rough estimate of the size you may want.  As you know, bra/cup size will vary depending on the brand.  Good luck with you.

Choosing the right implants for you takes a good physical exam and a thorough conversation reagrding your goals. I can not do that in a forum like this.  300 cc's may or may not give you what you want.
 

Breast Augmentation is a very small, narrow chested woman is a challenge for both the patient and the doctor. The high profile implants were developed to provide more projection in a smaller implant for a narrow chest. However, the overall dimension of the implant changes and in smaller sizes, they tend to look like a ball or melon. I recommend a moderate profile, with a full over fill in someone small like yourself. This gives a more natural shape, without excessive width of the implant. The difference between a 300cc moderate and 300cc HP is over 1 cm, and this could make a huge difference in long term shape. Ask your Plastic Surgeon to show you the implants side by side and try them in a bra before surgery.
Good Luck!

Patients tend to focus on cup size. It is impossible to reliably predict the cup size for patients who want a breast augmentation. A good way to get some idea of implant size is to have the patient try on implants with a clingy top. The patient should see hwat look they want. The patient and the plastic surgeon can then translate that to a range of sizes and styles of implants.
Once that is decided then the plastic surgeon can give the patient an idea of the positives and negatives of the sizes that are chosen. The larger the implants the less natural, the thinner the breast tissue becomes and the more likely to see or feel the implants.