Boobs shrunk after weight loss?!

I have seen that happen before. It doesn't always happen, but apparently did in your case. A B cup is perfect as commercial off the rack clothing is sized for B cup. Also, they won't sag and you won't have to wear a bra to sleep. There is a way to get larger breasts. It has to do with a certain prescription for another purpose. I wouldn't want to recommend that. Anything else, you read about is not a prescription and won't change the breasts. You will have an easier time with mammograms, and I am sure you look proportionate with your low weight. You could still wear a size C with a smaller underbust size, I think. Or, you get a bra with cushioned lifts in them from Victoria's Secret. One thing about breasts is that they are in flux throughout life. Nursing might cause them to disappear or change shape. Other variables cause changes. That is why I couldn't say this or that is natural. Only, that, what you are is all natural.

When you lose weight, you lose where ever you have fat tissue. This includes the breasts, so you should not be surprised to go from a C to a B (or a D to a C, or whatever change you experience) when you lose weight.

Options for going back to a C-cup:

Breast Augmentation Surgery (colloquially known as a "boob job")

Padded Bras

Push-up pads in your bra

or

Pregnancy (the 'girls' tend to grow some when one is expecting)


As for your height and weight, you could stand to carry a few more pounds without looking overweight. If you do put a few pounds back on, you can expect at least a few extra ounces in your boobs.

Honey, your breast mainly consists of fat and milk glands:P So if you loose weight, most likely your breasts will shrink as well(although how much is decided by your genes. Some have genes for big breasts, some have genes for small ones).
So if you are now at a healthy normal weight for your height and build, you could say B is your natural size.

Boobs are consisted mainly of fat so as you lost 20lbs from your body, you also lost it from your boobs. (one of the downsides to loosing weight). If you put weight back on, you are more then likely going to increase the size again.

When we gain weight, we also develop proportional fats in our bodies. Thats natural to lose cup size after losing weight. I dont think f u can get a larger breast without gaining weight at ur age except for some medical treatments.

you're probably not naturally a B since you are WAYYYYY underweight...
to be healthy, you should be at least 125 lbs according to BMI
i think you have a really bad health issue on your hands...

they need some natural stimulation...

plastic surgery
maybe post a picture so we can get an idea