the day you need an emergency transfusion you will regret it , especially if you are AB RH Null like me. There are only 57 people on the planet i can get blood from. But everybody can use my blood, I have to give out blood every 3 months, just for myself.
Parents should know about theirs babies blood type and what are the possible blood types they can give to their children depending on their inheritance blood type chart so they can avoid any problems and if there is any incompatibility parents should do DNA test
There are so much people who don't even know their own blood types, and actually there's nothing wrong with it. Even if they have to get a blood transfusion, nobody would believe them just by claiming that they had this and that blood type. Of course, I agree it's a basic information about yourself and your family, but I think it's relatively rarely occurs that two babies are switched at the hospital, or none of the parents know who the father of the child is.
Actually she did...bcoz later she talk to susan about a french guy they met on their holiday...but that's not how she got juanita, a drunk nurse change her baby with juanita