The third fontanelle.
D000015:Abnormalities, Multiple; D003120:Colorado; D000013:Congenital Abnormalities / Q000150:complications / Q000453:epidemiology; D004314:Down Syndrome / Q000150:complications; D005260:Female; D005315:Fetal Diseases / Q000150:complications; D006618:Hip Dislocation, Congenital / Q000150:complications; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011859:Radiography; D012409:Rubella / Q000151:congenital; D012886:Skull / Q000002:abnormalities* / Q000000981:diagnostic imaging; D013590:Syphilis, Congenital