[GOPJ]

Exposure of pregnant females to high doses of DBP (greater than 500,000 µg/kg BW/day) causes reduced fetal survival, reduced birth weights among surviving offspring, skeletal malformations and reproductive abnormalities in both male and female offspring associated with reduced fertility [15]. These three endocrine disruptors (BPA, DEHP and DBP) have been shown to be derived from various plastic bottles [16] and are common exposures in humans [6], [17].

Plastic baby bottles during the critical first few days of life (when mother's milk would normally carry the most important protections) could play a part... What I'm missing here - is why would this effect black women more than white women?

[Black Agnes]

Long story. Cultural assimilation of formula feeding might be one. Black women by and large do not breast feed.

They’re less likely to seek preconception/prenatal care and take prenatal vitamins.

[El Gato]

What I'm missing here - is why would this effect black women more than white women?

White women are more likely to nurse their babies rather than bottle feed them.

It was probably the other way around in the not too distant past. It was considered "modern". Even in Africa it's so considered now.