Part1: At 4:30 A.M., my husband walked in, saw me carrying our 2-month-old baby while cooking breakfast for his whole family, and said only one word: “Divorce.”

The kitchen tile was freezing against my bare feet, and the heavy smell of bacon grease mixed with burnt coffee and the sour scent of a baby bottle that had stayed too long in a mug of hot water.   His tiny cheek was warm against my T-shirt, his little fingers knotted into the stretched-out…