Sleeping on animal skin may reduce a baby's risk of developing asthma.
Germs in the hide and fur prime the immune system not to trigger allergies, scientists believe.
The finding comes from a study of 2,441 healthy German babies whose progress was monitored until the age of 10.
More than half (55 per cent) slept on animal skin during their first three months of life.
They were 79 per cent less likely to develop asthma by six years of age than children not exposed to animal skin.