"Seal" refers to a kind of congenital silly child, which is a disease caused by congenital factors that lead to brain dysplasia in children. In the past years, "seals" were not uncommon. With the improvement of people's living standards and medical conditions and the deepening of their understanding of reproductive health, the incidence of "seals" has been greatly reduced.
People's premarital examination, pregnancy care and screening system have also effectively reduced the birth rate of sick children.