https://www.sciencedaily.com/releases/2019/05/190508134511.htm

Woodhouse, an associate professor of counseling psychology, studied 83 low socioeconomic-status mothers and infants at ages 4.5 months, 7 months, 9 months and 12 months to observe and assess attachment. Infants and mothers in the study were racially and ethnically diverse, and infants were selected for high levels of temperamental irritability.

Her findings are detailed in "Secure Base Provision: A New Approach to Examining Links Between Maternal Caregiving and Infant Attachment," which appears in the journal Child Development, co-authored with Julie R. Scott of Pennsylvania State University, Allison D. Hepsworth of the University of the Maryland School of Social Work, and Jude Cassidy of the University of Maryland.