“Recent research conducted at the University of North Texas clearly reveals that the cortisol levels of babies left alone to CIO remain at unnaturally high levels even days after they learn to stop crying/cuing for help. However, the cortisol levels of mothers — which register as abnormally high when their babies cry — return to normal levels in the silence. At this point, mothers and babies are no longer biologically in sync. The mothers assume all is well; they interpret their babies’ silence as proof that their little ones have learned to self-soothe. Yet, physiologically babies can’t self-soothe. Rather, CIO teaches them to panic silently and detach from those whom nature intends for them to trust. ”