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. 2014 Aug 12;5:879. doi: 10.3389/fpsyg.2014.00879

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Copyright © 2014 Leavens, Sansone, Burfield, Lightfoot, O’Hara and Todd.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Parents did not differ in the amount of smiling they displayed for their infants, across the entire age range of this study, with infants from 6 to 18 months of age.