The earliest thumb suckers caught on camera
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2013/10/ls_-mouthmoves1_feat_FREE.jpg?fit=860%2C460&ssl=1)
This 32-week-old fetus’ mouth opens in anticipation of a touch, a purposeful movement that may form the basis of feeding behavior later.
Nadja Reissland
This 32-week-old fetus’ mouth opens in anticipation of a touch, a purposeful movement that may form the basis of feeding behavior later.
Nadja Reissland