( ( ( ( I ( was ( ( 9 weeks ) along ) ) ) but ) ( ( my fetus ) ( ( was not ) ( developed ( passed ( 6 weeks ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP I)) (VP (VBD was) (ADVP (NP (CD 9) (NNS weeks)) (IN along)))) (CC but) (S (NP (PRP$ my) (NN fetus)) (VP (VBD was) (RB not) (VP (VBN developed) (S (VP (VBN passed) (NP (CD 6) (NNS weeks))))))) (. .)))
I was 9 weeks along but my fetus was not developed passed 6 weeks.
(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.