My One-year-old Daughter Seems To Have What Looks Like Watermelon

My one-year-old daughter seems to have what looks like watermelon seeds in her poop she's been on a staff infection medicine and not feeling very well tired a lot, I was wondering if these black seeds if you will was a side effect from the medication that she's been taking or is it something else that I should be looking for? Should I be worried or say something to her General Dr