There are well documented increases in breast enhancement of one and a half to two inches in a matter of a just a few weeks. Studies have shown two main contributing factors in female breast enhancement.

One; the persons concept of her own ability and imaginations.

Two; the manipulation through hypnosis and removal of mental blocks to growth, such as desires to remain boyish in looks through unconscious motivations.

The perception in girls with the small breast problem often stems from the days when they were (and sometimes still are) regarded as 'daddy's girl'. They exist in a sheltered environment. After the young girl grows up and finds her new 'daddy' in the form of a boyfriend the role is again played out this time by the partner.
Subconsciously these women enjoy the benefits associated with the protective treatment they receive, strengthened by the fear of losing the dependency of the partner.  

The psyche sees no reason to develop 'full' adult breast's in the women whilst the message is consistently sent communicating that she has not fully grown up yet. Add this to the psyches knowledge that her body has still not lost its boyish looks, lacking the curves of a woman and we witness a formidable opponent to the females fight with her self-image.