you shouldn't ask whether the child is yin or yang, but rather whether the child belongs to yin or yang. Neutrons in the twelve earthly branches belong to water and belong to the north. There are two attributes of yin and yang in each direction in the divinatory images. The northern sea is yin water and the child is yang water. Hai is the convergence of all things and yin; The child is the beginning of all things and the yang.