My DS started repeating "poo" a few days ago. It is very funny to an extent, especially when he asks me for a "poo hug" or when he sings "Old Macdonald had a poo". When I asked him what he can say in French, he said "le poo". When I discourage it, he says it more. Ignoring it is having no effect. I try to change the subject when he has a poo outburst. Any suggestions?