The Yale University team says differences in the hormones generated by birth could be the key.
Mothers who give birth naturally are more responsive to the cry of their baby than those who choose to have a Cesarean.
American researchers carried out brain scans on 12 new mothers soon after giving birth and found more activity in areas linked to motivation and emotions in those who had a vaginal delivery.
The Yale University team says differences in the hormones generated by birth could be the key. The women in this study were those who elected to have a Cesarean.
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