I would watch her body go tense at the sound of it, watch her half-rise, as though the responsibility for quieting him were still hers, as though the four hours had wired something into her that told her a crying baby was a burden she alone had to fix.

So I made it my quiet, patient work to un-wire that.

Every time Leo cried, I made sure I got to him first, visibly, easily, so that Lily could watch, over and over, the simple fact of an adult handling it.

I wanted her nervous system to learn, one repetition at a time, the thing her mother had taught her the opposite of: that when the baby cries, a grown-up comes.

That it is not her job.