( ( ( Infancy and ) ( early childhood ) ) ( ( are ( times ( of ( rapid ( ( growth and ) development ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Infancy)) (CC and) (NP (JJ early) (NN childhood))) (VP (VBP are) (NP (NP (NNS times)) (PP (IN of) (NP (JJ rapid) (NN growth) (CC and) (NN development))))) (. .)))
Infancy and early childhood are times of rapid growth and development.
(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.