My Son’s Ribcage

My son’s ribcage is expanding. I know this because he feels different when he sits on my lap. Naturally, he is growing, that is what children do. He is getting taller (the top of his head just grazes my chin). He weighs more (it is an effort, now, to carry him upstairs). When he was a baby, he would curl up and rest his head in the area between my neck and shoulder, like he was molded to fit that singular space. I could be still for hours,