( ( ( ( ( ( ( Repeat births ) ( to teens ) ) ( have ( ( ( ( higher rates ) ( of ( ( serious problems ) ( than ( the ( first birth ) ) ) ) ) ) , ) ( including ( ( ( low ( birthweight babies ) ) , ) ( ( ( premature and ) stillborn ) infants ) ) ) ) ) ) , ) and ) ( ( ( a rate ) ( of ( infant mortality ) ) ) ( ( ( nine times ) greater ) ( than ( that ( of ( first-born infants ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (NN Repeat) (NNS births)) (PP (TO to) (NP (NNS teens)))) (VP (VBP have) (NP (NP (JJR higher) (NNS rates)) (PP (IN of) (NP (NP (JJ serious) (NNS problems)) (PP (IN than) (NP (DT the) (JJ first) (NN birth))))) (, ,) (PP (VBG including) (NP (NP (JJ low) (NN birthweight) (NNS babies)) (, ,) (NP (ADJP (JJ premature) (CC and) (JJ stillborn)) (NNS infants))))))) (, ,) (CC and) (S (NP (NP (DT a) (NN rate)) (PP (IN of) (NP (JJ infant) (NN mortality)))) (ADJP (ADJP (NP (CD nine) (NNS times)) (JJR greater)) (PP (IN than) (NP (NP (DT that)) (PP (IN of) (NP (JJ first-born) (NNS infants))))))) (. .)))
Repeat births to teens have higher rates of serious problems than the first birth, including low birthweight babies, premature and stillborn infants, and a rate of infant mortality nine times greater than that of first-born infants.
(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.