No. For the reasons people have said.
Also I don't accept that extra money automatically 'lifts children out of poverty'.
Poverty isn't just about money, it's about the quality if housing, the environment, education, services. An extra £50 a week doesn't change the structures of poverty.
I think we would better of putting any extra money into that stuff, than just handing it to parents, who can spend it on anything. Quite possibly nothing that benefits the child, even stuff that's harmful (alcohol, tobacco).
I'm a Labour voter and I feel strongly they should stick to their guns on this, and argue there's nothing progressive about 'hand-outs.'