Frontiers of Medicine: Dr. Spock, Meet Mr. Mom
Anemona Hartocollis Coping column on what seems to be cultural shift in which fathers are bringing their infants and children to pediatricians on Manhattan's Upper West Side; John Edwards, film producer who seems to have started trend 15 years ago, says he never set out to change pediatrician etiquette; Dr Max Van Gilder, who Edwards once visited, says he no longer works in all-women's world; drawing (M)

