( ( Fetal ( development week ) ) ( by week ) )
(ROOT (S (VP (VB Fetal) (NP (NN development) (NN week)) (PP (IN by) (NP (NN week))))))
Fetal development week by week
(ROOT (S (NP (DT The) (JJ fetal) (NN period)) (VP (VBZ lasts) (NP (NP (QP (RB approximately) (CD 30)) (NNS weeks)) (NP (NNS weeks)))) (. .)))