Where's 4? No, actually, where's my head?

We went for a walk. Whenever we go for a walk, my focus becomes not on where we are going, but on keeping track of the girls. I need to do several head counts. Today, like once before, link I had a moment of sheer fright as I thought I had lost one. I count 1 ... 2 ... 3 ... ... ... ... 4? Where's 4? 4!!!! After freaking out I realized, 4 was ... IN THE STROLLER I was pushing. I'm an idiot.