Hi ladies, my baby is 15 weeks old and i have just started to wean him in the last few days. Yesterday and the day before i gave him a small piece of mashed banana mixed with baby rice and his normal formula milk. Before this i just gave him the rice but i thought it looked and tasted so bland i decided to liven it up a bit.....since i did his poo has got strange black bits in it. The colour and consistancy is still the same and i can only describe these black bits as looking like little bits of black cotton thread . I'm a bit concerned....is this normal??