( ( ( ( ( ( Rapid ( fetal growth ) ) , ) ( especially ( of ( the brain ) ) ) ) , ) ( in ( the ( third trimester ) ) ) ) ( ( ( makes ( this ( ( a vulnerable ) period ) ) ) ( as well ) ) . ) )
(ROOT (S (NP (NP (NP (NNP Rapid) (JJ fetal) (NN growth)) (, ,) (PP (RB especially) (IN of) (NP (DT the) (NN brain))) (, ,)) (PP (IN in) (NP (DT the) (JJ third) (NN trimester)))) (VP (VBZ makes) (NP (DT this) (ADJP (DT a) (JJ vulnerable)) (NN period)) (ADVP (RB as) (RB well))) (. .)))
Rapid fetal growth, especially of the brain, in the third trimester makes this a vulnerable period as well.
(ROOT (S (NP (DT The) (JJ third) (NN trimester)) (VP (VBZ is) (VP (VBN associated) (PP (IN with) (NP (JJ rapid) (JJ fetal) (NN growth))))) (. .)))