From 18/20 weeks pregnant, a baby can hear sounds through mum's tummy. The mexican Bola is worn on a long necklace and placed low on the tummy where the baby is carried. The calming melody that the Mexican Bola produces while mum goes about her daily life will relax the baby. When baby is born, the same sound of that the Mexican Bola made when baby was still in the tummy is said to bring them comfort and familiarity. The mexican bola also makes a great nursing necklace for baby to fiddle with while nursing. The mexican bola is also said to keepsthe baby alert and will assist effective nursing. There has has been a lot said about the benefits of playing music for your baby while pregnant. However most people stop playing the music once baby is born which is counter active as the main reason to play music while pregnant is so that once baby is born into the big wide world the same music/melody will be familiar and as a result calming. Hence the benefits of wearing a Mexican Bola.