diarrhea when teething

[fifiandtheflowertots]

My ds is 10 month and is teething but with it has had really bad diarrea for the past few days,so bad that everywhere i go i have to take a few changes of clothes as for some reason its coming out the back of his nappy at the top and going everywhere.
Is there anything i can buy or even feed him that will help to bind him a bit?
tia

Can you put him in bigger napies so there's more nappy to catch the ineviatble?

its coming out the back at the top iykwim and ive put him in the next size up for now but they are a bit too big, its more to see what will help to harden up his poo's

Banana is reputed to constipate babies if that's any help but I don't know if it'll work with teething type nappies