7mth old with blood-streaked poo

[cakeforbrains]

DS2 is 7.5 months. Today he's had four really odd pooey nappies, with streaks of blood. The poo itself is also a pale green colour.
He had his first taste of meat (chicken) yesterday, so I'm wondering if that is to blame. I also wonder if he is slightly cows milk protein intolerant, but the GP and HV dismiss the idea.
This also happened about a month ago and we saw the GP who didn't comment on a cause, just told me to keep an eye on it and referred us to a paed. But that appt is not until 1st Dec.
Has anyone else had this with their DCs? If so what was the cause?

[cakeforbrains]

It's definitely blood, sadly. Hasn't had strawberries or any other 'red' food recently.
I'll try to get him a GP appt tomorrow but they were fully booked today.

[cookiemonstress]

has he had strawberries? I remember a friend of mine taking her baby to hospital thinking it was blood in the nappy and turned out to be strawberries.