It's simply this, Billy.
It seems to me it's high time you began to realize that you're Bertram's wife as well as the baby's mother." "That, I am--I don't think I quite understand," said Billy, unsteadily.
"No, I suppose you don't," sighed Kate, "though where your eyes are, I don't see--or, rather, I do see: they're on the baby, _always_.

It's all very well and lovely, Billy, to be a devoted mother, and you certainly are that.

I'll say that much for you, and I'll admit I never thought you would be.

But _can't_ you see what you're doing to Bertram ?" "_Doing to Bertram!_--by being a devoted mother to his son!" "Yes, doing to Bertram.

Can't you see what a change there is in the boy?
He doesn't act like himself at all.