I see multiple threads believing that there is a 2 child cap on child benefit - there is no limit on the number of children you can claim child benefit for
I also listened to a whole LBC phone in last week where the host advocated the same thing.
The cap relates to the child element of UC and TC only. If you are eligible to claim child benefit for your first 2 children you can claim for any subsequent children as well.
This is from gov.uk
www.gov.uk/child-benefit
"There’s no limit to how many children you can claim for."