"Morbidity" refers to the state of being diseased or unhealthy. It is often used to describe the number or rate of individuals who have a particular illness or condition within a specific population. Full definition
Family Management in the Prevention of Morbidity of SchizophreniaClinical Outcome of a Two - Year Longitudinal Study. (jamanetwork.com)
The last link addressed the issue best, I thought: «The increase in risk of severe maternal morbidities in non-white women seems to be independent of differences in age, socioeconomic and smoking status, body mass index, and parity between ethnic groups.» (skepticalob.com)
Breast milk provides antibodies against pathogens, and has been associated with reduced morbidity and mortality from gastrointestinal, respiratory and other diseases. (abcnews.go.com)