Is it true that the newborn child's fortune-telling said to avoid strangers 100 days?

Not all children have to do this, it's just because their lives are closed for a hundred days. Ancient medicine was underdeveloped, and he didn't know what bacteria were and what viruses were. He knew that some strangers were not allowed to contact, and he didn't ask the stranger if he ate civet cats and got SARS, or rode camels and got Middle East respiratory syndrome, or other diseases that could spread from person to person. Anyway, it's best to avoid them. The ancients thought that some children were born sensitive and prevention was better.