How cute. We call this her "bounce."
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/24186670@N00">Rachel Gutbrod</a> from USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/24186670@N00/382223694/">Flurrie</a>