You can tell by Crying... If the baby is in very serious pain she / he will scream and not stop until releive if the baby is in very little to no she/he will just make very fant sounds and you kind of can sens when a baby is in pain ...
I think it's because they need to be ready to help customers with questions and concerns regarding different medications, as well as watching out for signs of medication abuse.
hope this helps!!
Try c maybe , i’m not too sure sorry love. hope it kindaaa helps xxo
C) by changing tampons frequently