Educational psychologist William Fowler trained a group of parents to talk to their children in a particular fashion, following some of the guidelines mentioned above. The children spoke their first words between 7 and 9 months of age, some even speaking sentences at 10 months. They had conquered most of the basic rules of grammar by age 2, while kids in the control group achieved a similar mastery around age 4. Longer-term studies showed that the kids did very well in school, including in math and science.
