The third fontanelle.
D001724:Birth Weight; D000013:Congenital Abnormalities / Q000150:complications; D004314:Down Syndrome / Q000150:complications*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000150:complications*; D011859:Radiography; D012409:Rubella / Q000151:congenital*; D012886:Skull / Q000002:abnormalities* / Q000000981:diagnostic imaging