Neonatal mastitis is an uncommon condition that occurs in full term infants in the first few weeks of life. Girls are affected twice as often as boys. Initial management consists of intravenous antibiotics, while in cases of abscess formation, incision and drainage is indicated.1 Data on the long-term outcomes of neonatal mastitis are scarce. We aimed to examine whether mastitis in infancy affects consequent breast development in girls. The case notes of all peri-pubertal girls, who had been treated as infants for neonatal mastitis 10–15 years previously at a single institution, were reviewed retrospectively. Demographics, clinical …