Don't you mean umbilicus? The vent is what they poop out of, the umbilicus is where they absorb the yolk.What we need to do is shrink wrap him. I know this sounds weird, but this is will the only time we want to shrink wrap him, we need him to shrink that vent as fast as we can to avoid infection. So by lowering the humidity this should do the job. So lower that humidity to around 50-55.
-Kathy