My 13 month old son has been pooping out something that looks like green and black grapes. I don't feed him grapes, raisins or anything that looks like this. He has regular poop but, what ever these things are that looks like grapes are mixed in with it. I am very concerned that it may be something serious. It even looked like they have a small stem or something when i open one it looks like a real grape on the inside as well. Has anyone had this problem? Please help it's not poop or anything he has eaten.