Some may say there’s nothing like a dramatic gender reveal – monochromatic fireworks, exploding balloons and demolished cakes.But far from the modern-day blue-and-pink festivities, ancient Chinese astrologers, long revered for their apparent accuracy and knowledge, were predicting a child’s sex before their birth.How? Simply put, by comparing a mother’s age to a baby’s due date.More complicatedly, Dr. Sonia Tan, a traditional Chinese medicine (TCM) practitioner and astrologist, explains that ancient Chinese divination dates back to the Neolithic period, long before China’s first dynasty.It all starts, she says, with the I Ching – one of the oldest classic Chinese texts.“There’s a…