( ( Infant mortality ) ( ( is ( ( a measure ) ( of ( ( how many ) ( babies ( ( die ( during ( the ( first ( 12 months ) ) ) ) ) ( after birth ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Infant) (NN mortality)) (VP (VBZ is) (NP (NP (DT a) (NN measure)) (PP (IN of) (SBAR (WHADJP (WRB how) (JJ many)) (S (NP (NNS babies)) (VP (VBP die) (PP (IN during) (NP (DT the) (JJ first) (CD 12) (NNS months))) (PP (IN after) (NP (NN birth))))))))) (. .)))
Infant mortality is a measure of how many babies die during the first 12 months after birth.
(ROOT (S (PP (IN During) (NP (NP (DT the) (JJ first) (NN year)) (PP (IN after) (NP (NN birth))))) (, ,) (NP (DT a) (NN baby)) (VP (VBD called) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN infant))) (. .)))
During the first year after birth, a baby called a(n) infant.