If you weren't already feeling let down by what nature gave you, these ads would surely send you to the med cabinet in search of something to take away the pain.
There were boobie creams and suction devices and all sorts of wonderous bosom enhancing devices on the market.
Of course, they all worked, seeing all the ample chested girls today, right?
If you look closely at the ad, however, you are increasing your girth, not your assets. From a 34A to a 37A just means it's harder to buy a bra. Trust me, you don't want that band number increasing. You get into some interesting "bullet proof vest" looking bras. They scare my dogs, and double for hats during the winter.
If you have a tiny chest (lucky you!), just remember what mama told you. Chest out, shoulders back! Don't slouch!
And be damned grateful your cha cha's are tiny and not hanging down near your belly button.
Because they will, they will.