Undergoing tummy tuck and breast augmentation surgery at the same time can also have several potential drawbacks, including:

1. Longer Surgery and Recovery Time: Combining two major surgeries into one procedure can result in a longer surgical time and a more involved recovery process.

2. Increased Risk of Complications: Having multiple procedures performed at the same time can increase the risk of complications, such as infection, bleeding, or adverse reactions to anesthesia.

3. Increased Physical Stress: Combining two procedures into one surgery can increase the physical stress on the body, potentially making recovery more challenging.

4. Higher Cost: Having both procedures performed during the same surgery can be more expensive than having them done separately, as it often involves additional surgical and anesthesia fees.

5. Limited Customization: By having both procedures performed at the same time, patients may have less control over the outcome, as the surgeon may need to make compromises to balance the results between the two procedures.

6. Delayed Healing: Combining two procedures can lead to delayed healing, as the body is focused on recovering from both surgeries at the same time, which can lead to a longer and more challenging recovery process.

It is important to carefully consider the benefits and drawbacks of undergoing tummy tuck and breast augmentation at the same time, and to discuss the risks and limitations with a qualified plastic surgeon before making a decision.