Update: My husband of course kept his employer well informed ahead of time and did not call out last second or just not show up

Can my husband get fired if he had to miss work to watch my son while I had to go to labor and delivery overnight and didn’t get home in time for him to make it to work the next day? His employer is threatening it. Due to covid I can’t bring any visitors including my son with me, even without covid it’s not realistic to bring an 11 month old to the ER overnight while I’m on paid meds and can’t watch him regardless. Just curious if anyone has any opinions!/