( ( ( The ( fetal period ) ) ( of development ) ) ( ( ( lasts ( from ( ( ( about eight ) weeks ) ( -LRB- ( ( two months ) -RRB- ) ) ) ) ) ( until birth ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ fetal) (NN period)) (PP (IN of) (NP (NN development)))) (VP (VBZ lasts) (PP (IN from) (NP (NP (QP (RB about) (CD eight)) (NNS weeks)) (PRN (-LRB- -LRB-) (NP (CD two) (NNS months)) (-RRB- -RRB-)))) (PP (IN until) (NP (NN birth)))) (. .)))
The fetal period of development lasts from about eight weeks (two months) until birth.
(ROOT (S (NP (DT The) (JJ fetal) (NN period)) (VP (VBZ lasts) (NP (NP (QP (RB approximately) (CD 30)) (NNS weeks)) (NP (NNS weeks)))) (. .)))