I personally don’t think it sounds unusual. I was in hospital for 5 days with both my kids. My firstborn had a pneumothorax and needed monitoring in NICU. He was cleared on day 3 or 4 (can’t remember) and we left together on day 5. Second born had no issues and we stayed until discharge on day 5. I wanted to leave earlier, but was strongly advised by my OB and midwives to stay and get extra rest and time to bond with my newborn. I was at a private hospital both times, so not sure if that’s different to the public in terms of length of stay.
It’s probably likely that Sarah is trying to drum up engagement and sympathy by eluding to the fact that MKT has to stay for extra monitoring, whereas she is just staying the full time for bonding and rest