Credibility

- Spock revised the book Baby and Child Care (1968) - 50% drop rate in sales

- (1978) Revised the book once again after feminists objected to father-mother stereotypes

- Deleted "sexist" material and encouraged fathers on bigger parental responsibilities

- Spock kept up with contemporary times (as seen from revisions)

- He contributed to social issues like daycare centers, single parents, and mothers in the workforce