Baby Burnout??

After Mass on Sunday, as I was trying to keep track of all of my family members in the throng of people leaving church, dodging those who suddenly stopped to visit, I noticed my son weaving through the crown in front of me, going to visit with a friend of his from his former Montessori school. She is a year younger than he is, and was one of the only other Catholics at that school, so he & she would sometimes talk religion in the schoolyard. (To be a fly on the wall for those conversations!) Her mother was pregnant at the same time as I was with my daughter, and though she was due first, mine was born first (first of a group of 3 or 4 classroom babies, of which mine was supposed to come last!). Now, this particular girl is the daughter of a former NFP instructor and avid breastfeeding mom, and the oldest of 5 siblings, the youngest of whom was born in February, when her youngest brother was only 16 months old. So my son, happy to finally see a friend who would be interested in the news that he will be having a new sibling (sister), approaches and greets his friend. He then, casually, says that he will be having a new sister. She, clearly distracted, says, "Yes, she was born in February" (referring to her own, likely tired of having to give this information). My son corrects her, saying again, with more emphasis, that he would be having another sibling. She looks surprised and says, incredulously, "Another one?" (!!!??!)