tummy button
noun/ˈtʌmi bʌtn/
/ˈtʌmi bʌtn/
(British English) (also belly button British and North American English)
(informal) used especially by children or when speaking to children- the navel (= the small round part in the middle of the stomach, on the front of somebody's body, where the umbilical cord was cut at birth)
脐