At day care when parents visit have them sit in a circle. Blindfold a child and swaddle them so they can’t feel with their hands. Give the bundle to one of the mothers. Have the mothers pass the bundle until the child can tell who their mother is merely by how they are held and cuddled. You might want to you ear plugs to reduce hearing. How unique is a mother’s embrace?
or blindfold and swaddle a child in the middle of a circle and have a mother stroke the blanket. Can the child if their mother is stroking the blanket?