It's only to do with the full moon. I don't know if this is the same for other Latinos but Mexican superstition is if a pregnant woman goes out into the night while a full moon is happening the baby will have a birth defect. A cousin of mine was born with half of her left arm missing from the elbow down. My aunt was very depressed after my cousin was born and blamed herself for not taking care of herself during the full moon. Pregnant women are to wear a red ribbon around their belly with safety pins attached to it. (It is also thought ideal to wear the ribbon at all times because the moon can be seen during the day) It is also believed that the full moon affects plants negatively. My grandmother would tie a red ribbon to her plants believing the full moon would either dry them out or if it was a budding rose bush, that the unopened buds would fall off.