The Mười hai Bà mụ (chữ Nôm: 𱑕𠄩婆媒), or Thập nhị Bà thư (chữ Hán: 十二婆姐), "Twelve Midwives" also called Mẹ Sanh (or Mẹ Sinh, 媄生) are deities from Vietnamese mythology and folk religion.
They are twelve fairies who teach babies various prosperous traits and skills such as sucking and smiling.
[1] In some parts of Vietnam when a baby is one month old a special ritual is performed for the "Twelve Midwives.
but there is also a theory that these are the gods entrusted by the Ngọc Hoàng after he created a sufficient number of people and things in the lower world.
In other words, the 12 Bà mụ are gods who are responsible for shaping someone's body when ordered to reincarnate.