kitten with diarrhea

[Cluesue]

My 12 week kitten has had diarrhea since thursday,he had his 2nd vaccinations on Wednesday so am guessing this is a reaction.
He's alert,active,eating and drinking but i am a little concerned,anyone have experience of this please.

Little M had a runny bum (I had to wipe him after a poo) when he came to live with us at 12 weeks.

Lots of vet visits, and nothing was wrong - just adjusting to the excitement of a new environment, slow introduction of new food.

Won't harm to bring a (fresh) poo sample into the vets and ask them to analyse it though, to ensure it's not Giardia.