Thank you for the query.
Hole in belly button is usually the biggest one if it is about laparoscopy
. Through this hole the camera is inserted and also gallbladder
is taken out. That is why this area can give problems with healing.
The large lump you have noticed in your belly button area is most likely hernia
. Possible reason of it can be mentioned lifting your baby.
Other possible reasons are wound infection
, stone left in this area, irritation and inflammation due to stitches.
I suggest you to visit your surgeon and have it checked. If it is a hernia, the wound needs to get healed completely and after that it can be repaired (for about 3 months). If this is other mentioned condition, the wound needs to be checked and possible fluid drained.
Hope this will help.