( ( Fetal gallstones ) ( ( have ( a ( tendency ( to ( form ( in ( ( the ( third trimester ) ) ( of pregnancy ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Fetal) (NNS gallstones)) (VP (VBP have) (NP (DT a) (NN tendency) (S (VP (TO to) (VP (VB form) (PP (IN in) (NP (NP (DT the) (JJ third) (NN trimester)) (PP (IN of) (NP (NN pregnancy)))))))))) (. .)))
Fetal gallstones have a tendency to form in the third trimester of pregnancy.
(ROOT (S (NP (DT The) (JJ third) (NN trimester)) (VP (VBZ is) (VP (VBN associated) (PP (IN with) (NP (JJ rapid) (JJ fetal) (NN growth))))) (. .)))