When artists put the 'protruding pregnant bellybutton' on fat characters.

I mean, it's your art, if that's what you want fine, but you generally don't get that on someone with significant amounts of belly fat.

A few references:
https://bbw-chan.link/.media/502399.....e16b47382a.jpg
https://bbw-chan.link/.media/a18d1c.....865619198e.jpg
https://bbw-chan.link/.media/03d0e5.....02907ad8cc.jpg
https://bbw-chan.link/.media/3cfc18.....b8f5199289.jpg
https://bbw-chan.link/.media/3739aa.....efa1006ed2.jpg

If anyone knows some good pregfat artists, gimmie links!