as we all know we all were conceived by our parents, due to which we have a belly button because of the umbilical cord being attached to our tummy from the placenta of our mother.
but Adam and Eve did not have any parents, and so were born differently from the help of Allah(swt).
does that mean they do not have a belly button?
In Shariah there are more important things to strengthen our faith. Knowing about whether Adam and Hawwa had a belly button or not is not important. However, know that Allah created Adam and Hawwa complete so there shouldn’t be anything missing in them.