A mother’s emotional bond with her baby may start showing up in her brain before the baby is born, according to a small study from researchers at Yale University.
The researchers recorded resting brain activity in 35 women late in pregnancy, at an average of almost 37 weeks, using electroencephalography (EEG). They then compared it with the women’s scores on a standard questionnaire measuring maternal-fetal attachment: the emotional bond a pregnant woman feels toward her unborn baby, reflected in her thoughts, feelings and behaviour.
Imagining the baby
The questionnaire breaks attachment into three parts: anticipation (imagining the baby and life together), interaction (things like talking to or touching the belly in response to the baby’s movements), and differentiation (seeing the fetus as a separate person).
Women who scored higher on anticipation and interaction showed stronger coordination, or “coherence,” in a type of brain rhythm called alpha activity, both within the frontal regions and between the frontal and parietal regions on the left side of the brain. The links held after the researchers accounted for how far along the pregnancy was and whether the woman had given birth before.
“Our study suggests that individual differences in maternal brain connectivity are associated with specific aspects of the emotional bond with the fetus,” said Helena Rutherford of Yale, a senior author of the study.
Why it matters
Earlier research has found that stronger attachment during pregnancy is linked to stronger bonding after birth, more sensitive parenting and more responsive interactions between mother and baby. But little is known about what happens in the brain. The authors say their results point to a possible neural signature of the prenatal bond.
Limitations
The study is small and shows a correlation at one point in time. It can’t say whether brain connectivity shapes attachment, or the reverse. Attachment was self-reported, and the findings need to be repeated in larger and more diverse groups. The research was supported by the Bial Foundation, a Portuguese foundation that funds behavioural and brain research.
Source: Ayala, K., Niu, K., Murray, C. L., Voegtline, K., & Rutherford, H. J. V., “Bonding before birth: Maternal–fetal attachment and maternal cortical connectivity in late pregnancy,” Journal of Neuroendocrinology, Sept. 8, 2026. doi:10.1111/jne.70251; Bial Foundation news release, Nov. 4, 2026.
