1 answer
(click or scroll down)
I agree.
http://www.ncbi.nlm.nih.gov/pubmed/11194253
http://docs.google.com/viewer?a=v&q=cache:QoBkNV3SYegJ:homepage.psy.utexas.edu/homepage/group/cohenlab/pubs/ICIS_Infant_Math_Debate.pdf+infant+add+and+subtract&hl=en&gl=us&pid=bl&srcid=ADGEESjTO4B3QYz43tulFPQrNqpPiSVQrcTVqNy4Eykwh3YnKMdf5w9aRKa8cVnpPvVkwz_MK9AB4ixpg8HdFlsgARGDTX7C5CsiKHTphvLRntxS8XEd67ENjK8bg2KDnaqV3GwXae1l&sig=AHIEtbS6bItHNDm-EpQwvpohQK0TdvZt4g