( ( ( infancy Period ) ( between ( ( birth and ) ( two years ) ) ) ) . )
(ROOT (NP (NP (NN infancy) (NN Period)) (PP (IN between) (NP (NP (NN birth)) (CC and) (NP (CD two) (NNS years)))) (. .)))
infancy Period between birth and two years.
(ROOT (S (NP (NP (DT The) (JJ first) (NN year)) (PP (IN after) (NP (NN birth)))) (VP (VBZ is) (VP (VBN called) (NP (NN infancy)))) (. .)))