The pregnancy bola is considered a symbolic jewel and brings many benefits to the mother and her baby during pregnancy. In particular, it is often associated with a soothing and calming effect on the mother, which can help reduce stress and anxiety during pregnancy.

There are several theories as to how the pregnancy bola produces this soothing effect on the mom. Here are some possible explanations:

1. The sound of the pregnancy bola can be perceived as white noise, which is a smooth, steady background sound that can help mask disturbing noises from the environment. It can help create a calm and peaceful environment for mom and baby, who can feel more relaxed and secure.

2. The sound of the pregnancy bola can also be perceived as a kind of regular and constant rhythm, which can help create a kind of regular and reassuring "beat" for the baby. The baby can then become familiar with this rhythm and feel more secure and peaceful.

3. The pregnancy bola can also act as a constant reminder of the presence of her baby. By wearing the bola close to her tummy, mom can feel the little ball move with every movement, which can help create a stronger bond with her baby. This bond can help reduce anxiety and stress, creating a sense of connection and security.

Ultimately, the soothing effect of the pregnancy bola may be due to a combination of these different factors, as well as other personal factors such as the positive associations the mom has with the jewelry and the symbolic importance which she gives him. Either way, many moms find that wearing a pregnancy bola helps them feel calmer and more relaxed during pregnancy, which can have benefits for their mental and physical health, as well as for that of their baby.