Exactly the number of children's doctors has been decreasing gradually. The work of children's doctors is very hard, and pay is not enough.
Moreover the number of children has been decreasing in Japan. And so the role of children's doctors and obstetricians will become smaller and smaller. The birth rate has tended to decrease in advanced countries.
But I don't worry about this situation, because human beings have instinct of reproduction. Social condition has been always changing, but instinct of human beings has not changed anytime.