As revealed in The Mark of Athena, despite not being born in the usual way (being a "brain child" of Athena), Annabeth still does have a belly button.
YOU ARE READING
Fandom Facts you may not know
RandomLe facts you may not know about your fandom Also some theories from time to time.... And headcannons..... (Don't ask me for sources b/c I find most of these facts on random websites I stumble upon)
Belly button
As revealed in The Mark of Athena, despite not being born in the usual way (being a "brain child" of Athena), Annabeth still does have a belly button.