Or 'daddy'?
Just wondering. I have never really heard any of my school kids (11-16) say it but a mum spoke to me this week and during the course of the conversation said similar to "My son would always say 'Mummy here is my homework'" (for example). I found it so cute!
I think I was still really far too old and was probably still saying mummy and daddy when I was 10/11. In private I think I maybe even said it a bit longer... cringe.