The baby boomers are commonly defined as being born from 1946-1964. Griswold v Connecticut which affirmed the rights of _married people_ to use contraceptives,

The baby boomers are commonly defined as being born from 1946-1964. Griswold v Connecticut which affirmed the rights of _married people_ to use contraceptives, was decided in 1965. Unmarried people didn't get the right to use contraception until 1972. Roe v. Wade wasn't until 1973. Even after those were decided, my understanding is that in a lot of places there was a strong stigma against family planning (i.e. just because you had a legal right to use contraceptives didn't mean your doctor would prescribe birth control). So for the generation you're talking about, the choice was often effectively not "should we not have (more) kids?" but "should we, a married couple, not have sex for a period of decades?" which is a lot tougher to choose.