There are a lot of reasons why a lady might experience a mild gain in weight in the early post-op period following breast augmentation. The most commonly thought of source is the implants themselves, so let's dispense with that right now. Assuming you've had silicone gel, let's just say for the sake of argument that any differences in density/mass between gel and saline are negligible for our purposes, so 1 cc of gel has the about the same mass (1 gm) as 1 cc of saline (if you have saline implants, that point is moot). You have 375 cc implants, which times two gives a total increase in the mass of your body of 750 gm attributable to implant gel. So if we give a little for the shells too, that's roughly 1 kg, or so, of your weight gain. The rest has to come from some other source, and provided that you are comparing your current weight at 6 days post-op with your weight roughly on day of surgery or day before (and using the same scale under the same measuring conditions, i.e., clothing, time of day, etc), it is highly unlikely that you have packed on a total of 4 kg of "real" weight, meaning either muscle mass, or more dreaded, body fat. Maybe some of that can be attributed to a bit of fat gain since you may not be as active as you normally are, but I would venture to say that a lot of it is fluid, or edema, in your tissues. This can be a substantial source of added weight gain, just ask any lady that retains fluid around "that time of the month," and once this fluid is gone the weight normalizes. At 6 days post-op you might only now be starting to mobilize edema from the tissues around your breasts as well as your feet, ankles, and lower legs, all of which will take on this fluid in some people, and all of which enjoy the ride on the scale with you! One liter of excess fluid gives you one kilo of your excess weight. Try to cut back on your salt intake, ask your doctor for a diuretic if you actually have visible signs of fluid retention, and start getting back to your more normal daily activities (with the guidance of your surgeon, of course) and dietary intake. If this doesn't start normalizing things within the next week or so, run it by your surgeon and get his or her input and advice. But until then, probably no need to feel so gutted!
