( Kittens ( ( ( ( develop ( a ( mottled look ) ) ) ( at ( ( ( around 8 ) weeks ) ( of age ) ) ) ) ( as ( ( the ( lighter undercoat ) ) ( starts ( to develop ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Kittens)) (VP (VBP develop) (NP (DT a) (JJ mottled) (NN look)) (PP (IN at) (NP (NP (QP (RB around) (CD 8)) (NNS weeks)) (PP (IN of) (NP (NN age))))) (SBAR (IN as) (S (NP (DT the) (JJR lighter) (NN undercoat)) (VP (VBZ starts) (S (VP (TO to) (VP (VB develop)))))))) (. .)))
Kittens develop a mottled look at around 8 weeks of age as the lighter undercoat starts to develop.
(ROOT (S (PP (IN By) (NP (CD 8) (NNS weeks))) (, ,) (NP (DT all) (JJ major) (NNS organs)) (VP (VBP start) (S (VP (VBG developing)))) (. .)))