A main source for the ages
The development of prehension in infants: Halverson revisited
George E. Butterworth, E. Verweij, Brian Hopkins · 1997 · British Journal of Developmental Psychology
- Children
- Not given in the summary we read
- Where
- Not given in the summary we read
- Ages
- 6 to 20 months
- How
- Researchers watched babies pick up objects
- What it found
- Grasping with the fingertips gradually takes over from whole-hand grasping, and by the second year it is the main way babies pick things up.
- Limits
- We have only read the summary, which gives no ages for the finger-and-thumb grip.