( ( ( ( ( Normally ( ( ( the ( XY ( chromosome fetus ) ) ) ( -LRB- ( male -RRB- ) ) ) ( automatically ( ( develop testes ) ( in ( ( the ( seventh week ) ) ( of development ) ) ) ) ) ) ) , ) and ) ( ( they ( in turn ) ) ( produce ( ( the ( male hormones ) ) ( that ( immediately ( begins ( to ( develop ( ( ( a ( male brain ) ) and ) ( other ( male features ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (ADVP (RB Normally)) (NP (NP (DT the) (NNP XY) (NN chromosome) (NN fetus)) (PRN (-LRB- -LRB-) (ADJP (NN male)) (-RRB- -RRB-))) (VP (ADVP (RB automatically)) (VBP develop) (NP (NNS testes)) (PP (IN in) (NP (NP (DT the) (JJ seventh) (NN week)) (PP (IN of) (NP (NN development))))))) (, ,) (CC and) (S (NP (NP (PRP they)) (PP (IN in) (NP (NN turn)))) (VP (VBP produce) (NP (NP (DT the) (JJ male) (NNS hormones)) (SBAR (WHNP (WDT that)) (S (ADVP (RB immediately)) (VP (VBZ begins) (S (VP (TO to) (VP (VB develop) (NP (NP (DT a) (JJ male) (NN brain)) (CC and) (NP (JJ other) (JJ male) (NNS features)))))))))))) (. .)))
Normally the XY chromosome fetus (male) automatically develop testes in the seventh week of development, and they in turn produce the male hormones that immediately begins to develop a male brain and other male features.
(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.