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That looks like it's coming out of the vent, not the belly. That also doesn't look like yolk, which is yellow. I've hatched a duck with its yolk out last year. I just put a warm damp paper towel under it in the brooder and checked in it every 30 min. Your pic looks likes the chicks bowels are coming out of the vent. There's no treatment for that.
I will go anc check to see for sure. If it is out of the vent, what would cause that?