In Death Stranding a 'Bridge baby', also known as a 'BB', is a baby that has been taken from a stillmother to be used by Bridges operatives due to its connection to the world of the dead. BB's are mainly used by Bridges operatives to sense the presence of Beached Things and because of their fragile countenance need to be kept believing they are in their mother's womb while they are in the portable pod. This can be achieved by keeping the BB stress-free.