The little one

A woman in Florida has designed a pillow incorporating parts of dummies used for first aid training to help people develop the perfect what? Solve the crossword, then read down the yellow squares to find the answer.

ACROSS

1 British deciduous tree (3) 3 Assistance (3) 5 Wooden shoes (5) 7 Knock sharply (3) 8 Word of agreement (3)

DOWN

1 Lubricant (3) 2 Love deeply (5) 3 Playing card with one big pip (3) 4 Serpent from the Nile (3) 6 Airy matter (3)