El Mal de Ojo: the Evil eye.

If you smile at a baby you better touch it or you'll make the baby sick.

"El mal de ojo," roughly translates to evil of the eye. So, don't look at cute babies otherwise they'll get high fevers. The whole situation is just illogical, but if you want the baby to be protected then you have to put some charmed jewelry on them or form some sort of egg concoction.

The evil eye is a curse believed to be cast by a malevolent glare, usually given to a person when they are unaware. Many cultures believe that receiving the evil eye will cause misfortune or injury. Talismans created to protect against the evil eye are also frequently called "evil eyes".

The idea expressed by the term causes many different cultures to pursue protective measures against it. The concept and its significance vary widely among different cultures, primarily in West Asia. The idea appears several times in translations of the Old Testament. It was a widely extended belief among many Mediterranean and Asian tribes and cultures. Charms and decorations with eye-like symbols known as nazars, which are used to repel the evil eye, are a common sight across Armenia, Albania, Turkey, Egypt, Iran, Iraq, Morocco, Greece, the Levant, Afghanistan, Syria, Southern Spain, and Mexico have become a popular choice of souvenir with tourists.
the Hamsa is also known as a good luck
charm that repels the Evil Eye.