The first researchers to use magnetic resonance imaging (MRI) to study the brains of a large group of babies soon after birth found a small amount of bleeding in and around the brains of one in four babies who were delivered vaginally. “It seems that a normal vaginal birth can cause these small bleeds,” said lead author John H. Gilmore, M.D., from the University of North Carolina School of Medicine in Chapel Hill.
Source: RSNA. "Intracranial Hemorrhage in Asymptomatic Neonates: Prevalence on MR Images and Relationship to Obstetric and Neonatal Risk Factors (Looney, et al.)"