I am in the same situation, Child renewal Application started on 11th April at my local post office, updated to Documents received on 28th April, updated to In Processing on 29th April. Now the 29th April in processing status has been removed.
At the same time on the 11th April I also submitted an application for a passport renewal for my other child who had just turned 16. So his was done as a first Adult passport, that whole process was really fast and I had his new passport in my hand on 29th April.
I guess they will say that my average wait time is very good, but I would rather be able to go on holiday with both of my children, rather than just one of them !