My 6 m.o. just started solids 2 days ago. So far he's had tiny bits of avocado, banana, plain whole milk yogurt, and organic baby oatmeal mixed with breastmilk. Hes been ebf up until now and I am still breastfeeding. Just now I changed his diaper and his poop looks like this, with these little bits of something that I don't know what they are. Can anyone tell me if this is normal? Thanks!!