( However ( , ( ( ( the criteria ) ( required ( for ( these diagnoses ) ) ) ) ( ( ( may not ) ( ( ( ( be ( apparent ( at birth ) ) ) and ) often ) ( ( ( develop gradually ) ( from infancy ) ) ( through ( ( the ( first ( few years ) ) ) ( of ( ( grade school ) ( -LRB- ( 6 -RRB- ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (NP (NP (DT the) (NNS criteria)) (VP (VBN required) (PP (IN for) (NP (DT these) (NNS diagnoses))))) (VP (MD may) (RB not) (VP (VP (VB be) (ADJP (JJ apparent) (PP (IN at) (NP (NN birth))))) (CC and) (ADVP (RB often)) (VP (VB develop) (ADVP (RB gradually)) (PP (IN from) (NP (NN infancy))) (PP (IN through) (NP (NP (DT the) (JJ first) (JJ few) (NNS years)) (PP (IN of) (NP (NP (NN grade) (NN school)) (PRN (-LRB- -LRB-) (NP (CD 6)) (-RRB- -RRB-))))))))) (. .)))
However, the criteria required for these diagnoses may not be apparent at birth and often develop gradually from infancy through the first few years of grade school (6).
(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))))))) (. .)))