"Turned out fine" is highly subjective. The peak violence rates in the US happened when that cohort was 22; right around the age at which people commit the most violent crimes. So at least on that one metric, that cohort was probably among the worst ever (I'm not claiming a relationship to breastfeeding, of course).
Breastfeeding declined dramatically from 1910 to 1945 (and stayed below 30% from 1945-1970s). While crime went up from 1965+, it also went steadily down from 1935-1960.
