Because they are brand new.
Because babys butts are softer than anything! Ecspeacially to A NEW MOM!
Babies have butts because they are born with them.
all babies born with green butts have African blood mixed in their blood
yes all dog females have babies out of there bedongkidongks
because they used baby oil
Because of Butt implants or lazy butts
Because it's more comfortable than sleeping with their head in the air. 
The cast of So That You Can Live - 1981 includes: Diane Butts as herself Shirley Butts as herself Royston Butts as himself
many were babies, they would get taken from their mothers and then they are slaves, they would work their butts off.
Genetics or possibly Working out.
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Like a babies bottom...