Eeugh!!!
I did totally freak out tho the first time DD ate banana (she refused babyrice for the best part of a week, so offered her mushed banana and she wolfed down 2/3 of it!!) The nappy the next morning was FULL, it was normal yellow (BF milk) colour, but had loads of little black/dark green wormy things ...I freaked as I thought she had worms until I saw that her unwashed bib also had the same black banana fibres on it!!! DOH!!
I even took a photo in the beginning to post on here as I was so worried!! I still have it somewhere ...