Methods
The literature was searched via Scopus and PubMed for the following key words: 'neonate', 'newborn', 'infant' in combination with either 'endometrium', 'uterine bleeding', 'endometriosis', 'ultrasound' and 'vaginoscopy'. In addition, references were examined in published papers on related topics. The literature search included medical articles published in French, German and English.