This is what I have learned about this topic:
Tremendous biological, chemical and physiological changes occur at the instant a new born baby draws in the first breath and consequently lets out his or her first cry. In the Scriptures it is said, “I will breathe the breath of life into them”. At this moment in time, more than 400 million electromagnetic cells in the brain become programmed, like a computer by the invisible, but powerful cosmic frequencies, or light waves, coming from our Sun, our Moon and the planets in our solar system. This occurs in a pattern corresponding to their position in space and their mathematically and astronomically -measured aspects to one another in that magnetically-charged moment in time. The baby will feel a powerful electromagnetic tug and become “programmed” so to speak. If this baby could see the heavens above at that moment, he or she would see their birth chart. This tug actually can be accepted or rejected through the gift of free will, each time in the future when the Sun, Moon and planets conflict or harmonize with each other and the baby’s programmed natal chart. However, after doing hundreds of birth charts, I have found that most people do live out their chart and experience recurring planetary transits in the working out of their lives. Transits can trigger a psychological response or an actual life experience, depending on the angle each planet is making to each planet in the birth chart. These are called Conjunctions, Oppositions, Sextiles, Trines or Squares (as well as minor aspects not listed) and depending on the angle, these feelings or experiences will appear to be happy or helpful, perhaps challenging or irritating or frustrating. But, all serve a purpose in our lives, to help us along or to teach us lessons, that also ultimately help us along.