I have a 6mo old and he ate about 1/2 a banana this afternoon. Tonight he had black stringy things in his poop. He s also had diarrhea for about 4 days, but it s improving. I ve read a bunch of people saying the black stringy things are bananas, another site said parasites. He seems fine otherwise, except for a sore bottom. Have been watching for dehydration and he appears fine on that end as well. Are black, stringy, worm-looking fibers common with bananas?