A main source for the ages
Means‐end problem solving in infancy: Development, emergence of intentionality, and transfer of knowledge
Iryna Babik, Andréa Baraldi Cunha, Samantha M. Ross, Samuel W. Logan, James Cole Galloway, Michele A. Lobo · 2018 · Developmental Psychobiology
- Children
- About 20 babies
- Where
- Delaware, United States
- Ages
- 6 months to 2 years
- How
- Researchers visited the same babies at home as they grew
- What it found
- Babies started pulling a towel on purpose to reach a toy at about 6½ to 7 months. The share of tries that worked rose from about 4 in 10 at 6 months to about 9 in 10 at 2 years.
- Limits
- A very small group. The paper gives slightly different ages in its summary and its results, so the exact figures need checking.