( Folate ( ( The ( central ( nervous system ) ) ) ( ( ( develops ( in ( the fetus ) ) ) ( during ( ( the ( first weeks ) ) ( of gestation ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Folate)) (NP (DT The) (JJ central) (JJ nervous) (NN system)) (VP (VBZ develops) (PP (IN in) (NP (DT the) (NN fetus))) (PP (IN during) (NP (NP (DT the) (JJ first) (NNS weeks)) (PP (IN of) (NP (NN gestation)))))) (. .)))
Folate The central nervous system develops in the fetus during the first weeks of gestation.
(ROOT (S (NP (NP (DT The) (NN development)) (PP (IN of) (NP (NP (DT the) (JJ respiratory) (NN system)) (PP (IN in) (NP (DT the) (NN fetus)))))) (VP (VBZ begins) (PP (IN at) (NP (QP (RB about) (CD 4)) (NNS weeks)))) (. .)))
The development of the respiratory system in the fetus begins at about 4 weeks.