Being closer to your goal weight and having a stable weight generally helps tummy tuck results. At 5'3" and 145 lb, many patients can still be reasonable candidates if they are healthy, not smoking, and their weight is stable. A smaller amount of excess fat can make contouring more predictable and may reduce some surgical risks compared with operating at a significantly higher weight. That said, the result is not based on weight alone. The key issues are how much loose skin you have, whether there is muscle separation after pregnancy or C-section, how much fat is under the skin versus inside the abdomen, your skin quality, scar placement, and healing factors. Someone heavier with mostly loose skin and good muscle repair may still do well, while someone lighter with significant internal abdominal fullness may not get a very flat result. If your main concern is a post-C-section lower belly bulge, a tummy tuck with appropriate muscle repair, when needed, can be very effective. The best timing is when you are finished with pregnancies, at a maintainable weight, and able to take the recovery time seriously. An in-person exam is needed to know whether you would need a full tummy tuck, mini tummy tuck, liposuction, or a combination.