( ( Its onset ) ( ( ( ( ( occurs ( during ( ( the ( first years ) ) ( of life ) ) ) ) , ) ( anytime ( from infancy ) ) ) ( to three ) ) . ) )
(ROOT (S (NP (PRP$ Its) (NN onset)) (VP (VBZ occurs) (PP (IN during) (NP (NP (DT the) (JJ first) (NNS years)) (PP (IN of) (NP (NN life))))) (, ,) (ADVP (RB anytime) (PP (IN from) (NP (NN infancy)))) (PP (TO to) (NP (CD three)))) (. .)))
Its onset occurs during the first years of life, anytime from infancy to three.
(ROOT (S (NP (NNP Infancy)) (VP (VBZ is) (NP (NP (DT the) (JJ first) (NN year)) (PP (IN of) (NP (NP (NN life)) (PP (VBG following) (NP (NN birth))))))) (. .)))