( ( ( ( Approximately 30 ) gallons ) ( per week ) ) . )
(ROOT (NP (NP (QP (RB Approximately) (CD 30)) (NNS gallons)) (ADJP (IN per) (NN week)) (. .)))
Approximately 30 gallons per 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)))) (. .)))