( This ( ( is ( because ( ( ( ( approximately 70 ) percent ) ( of ( fetal growth ) ) ) ( occurs ( during ( ( the ( last ( ( ( 4 to ) 6 ) weeks ) ) ) ( of pregnancy ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (SBAR (IN because) (S (NP (NP (QP (RB approximately) (CD 70)) (NN percent)) (PP (IN of) (NP (JJ fetal) (NN growth)))) (VP (VBZ occurs) (PP (IN during) (NP (NP (DT the) (JJ last) (QP (CD 4) (TO to) (CD 6)) (NNS weeks)) (PP (IN of) (NP (NN pregnancy))))))))) (. .)))
This is because approximately 70 percent of fetal growth occurs during the last 4 to 6 weeks of pregnancy.
(ROOT (S (NP (DT The) (JJ fetal) (NN period)) (VP (VBZ lasts) (NP (NP (QP (RB approximately) (CD 30)) (NNS weeks)) (NP (NNS weeks)))) (. .)))