This belief is strong in hispanic communites. In my region of Texas, we only use the safety pin to fasten a key, because according to those who believe this, the key is what protects the fetus from harm. When my mother was pregnant with me, there was en eclipse (not sure whether full or partial) but when I was born, I came out fine (and my mother will swear it was because she wore the key) and there were several babies who were born with a cleft lip. My mother and grandmother will use this as irrefutable evidence that a key should be worn during an eclipse, especially since multiple babies had the same problem. I just dismiss it as craziness, kinda like the "mal de ojo" sickness a baby gets. Anyone ever heard of that? It involves rubbing an egg on a feverish baby....Hopefully these crazy beliefs will fade out with time and science class.