( ( In ( the ( human fetus ) ) ) ( , ( ( ( ( ( ( the ( genital tubercle ) ) ( develops ( around ( ( week 4 ) ( of gestation ) ) ) ) ) , ) and ) ( ( by week ) ( 9 ( ( ( becomes ( ( recognizably either ) ( a clitoris ) ) ) or ) penis ) ) ) ) . ) ) )
(ROOT (S (PP (IN In) (NP (DT the) (JJ human) (NN fetus))) (, ,) (S (NP (DT the) (JJ genital) (NN tubercle)) (VP (VBZ develops) (PP (IN around) (NP (NP (NN week) (CD 4)) (PP (IN of) (NP (NN gestation))))))) (, ,) (CC and) (S (PP (IN by) (NP (NN week))) (NP (CD 9)) (VP (VP (VBZ becomes) (NP (ADJP (RB recognizably) (DT either)) (DT a) (NN clitoris))) (CC or) (VP (VBZ penis)))) (. .)))
In the human fetus, the genital tubercle develops around week 4 of gestation, and by week 9 becomes recognizably either a clitoris or penis.
(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.