>>937924172Black women give birth to fully developed babies a full week earlier than white women.
https://academic.oup.com/ije/article/33/1/107/668109
Mixed race black and white couples face higher odds of prematurity and low birth weight, which appear to contribute to the substantially higher demonstrated risk for stillbirth.
http://archive.is/gyKM6
Adolescents who identify themselves as mixed race are at higher health and behavior risk than those of 1 race.
http://archive.is/hbpsV
Prematurity and Low Birth Weight are a lot more common in mixed-race babies
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2867623/
Mulatto teenagers show much more anti-social behaviour than both black and whites teenagers:
*https://www.sciencedirect.com/science/article/abs/pii/S0165032723014088
[http://www.msu.edu/~renn/RHE-_mixed_race.pdf]