See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/247229917 Changes across the first year of life in infants’ daily activities and social contacts among middle-class Anglo and Puerto... Article in Infant Behavior and Development · March 2001 DOI: 10.1016/S0163-6383(01)00080-7 CITATIONS 5 READS 63 4 authors, including: Some of the authors of this publication are also working on these related projects: SEIKA-NRW (Early language education in preschools) View project Xin Feng The Ohio State University 32 PUBLICATIONS 511 CITATIONS SEE PROFILE Robin L Harwood Maternal and Child Health Bure… 47 PUBLICATIONS 1,488 CITATIONS SEE PROFILE Birgit Leyendecker Ruhr-Universität Bochum and M… 68 PUBLICATIONS 728 CITATIONS SEE PROFILE All content following this page was uploaded by Xin Feng on 14 January 2017. The user has requested enhancement of the downloaded file.