Childermass gives a moment's pause. Will he help with the child? Well as far as he's concerned it isn't strictly necessary. But he's here anyway, and the other man may be a lot of things but he's a Guardian besides them. Refusing to aid a Guardian, no matter how soft that person might seem, could come back to bite him later on. And not just him, but Norrell as well.

So Childermass inclines his head slightly after giving the question the consideration that he should, before responding. "If you should require it... I am here."