( They ( ( are ( ( ( called ( ( babies or ) infants ) ) while ) ( in ( the nest ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP are) (VP (VBN called) (NP (NNS babies) (CC or) (NNS infants)) (NP (NN while)) (PP (IN in) (NP (DT the) (NN nest))))) (. .)))
They are called babies or infants while in the nest.
(ROOT (S (PP (IN During) (NP (NP (DT the) (JJ first) (NN year)) (PP (IN after) (NP (NN birth))))) (, ,) (NP (DT a) (NN baby)) (VP (VBD called) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN infant))) (. .)))
During the first year after birth, a baby called a(n) infant.