(S (S (NP (NP (BASENP (NN Amount)) (PP (IN of) (NP (BASENP (NN time)) (VP (VBN spent) (PP (IN in) (NP (BASENP (NN daycare)) (CC and) (BASENP (JJ social) (NN activity)))))))) (PRN (COMMA ,) (PP (IN during) (NP (BASENP (DT the) (JJ first) (NN year)) (PP (IN of) (BASENP (NN life))))) (COMMA ,))) (VP (VBD were) (VP (VBN used) (S (VP (TO to) (VP (VB gauge) (NP (BASENP (DT the) (NN level)) (PP (IN of) (NP (NP (BASENP (NN exposure)) (PP (IN of) (BASENP (DT the) (NNS infants)))) (PP (TO to) (NP (BASENP (JJ common) (NNS infections)) (PP (JJ such) (PP (IN as) (BASENP (NN cold) (CC and) (NN flu))))))))))))))) (PERIOD .))