( ( development ( in ( infancy ( , ( ( childhood and ) adolescence ) ) ) ) ) ; )
(ROOT (NP (NP (NN development)) (PP (IN in) (NP (NN infancy) (, ,) (NN childhood) (CC and) (NN adolescence))) (: ;)))
development in infancy, childhood and adolescence;
(ROOT (S (NP (DT An) (NN individual)) (VP (VP (VBZ grows) (ADVP (RB quickly))) (CC and) (VP (VBZ develops) (NP (JJ new) (NNS abilities)) (PP (IN during) (NP (PRP$ their) (NN infancy) (CC and) (NN childhood))))) (. .)))
An individual grows quickly and develops new abilities during their infancy and childhood.