Babies with illnesses are common which is why baby safety monitors were invented. There are many health problems that an infant may acquire during pregnancy. Although it is the responsibility of the parents to take care of their child, they also have responsibilities with their family. This is why they need help in taking care of their sick child.
Mary Poppins is the most famous nanny in the world, but aside from flying over rooftops, nannies are a major global business. Historically, nurses were probably the first nannies, hired as live-in custodians to care for the children of the household.