Re: lump near my belly button
Sounds to me like it could be a hernia. It's not life threatening but you should have the doctor look at it as soon as possible. I'm not sure of the exact location so can't say for sure. My daughter had one at six months old on her right side; her daughter had one at three years old at her belly button, and I had one this year (70 years old) on my right side but further away from the navel. Obviously hernia don't discriminate so far as age.
If it's a hernia, it will not heal itself and the longer you wait, the worse it could get so have it checked when you can.