This represents the source of research ideas called classroom lecture.
There are several sources which can inspire and help someone to develop a research question. Some of them are theory, everyday occurrence, serendipity and past research. In this case, Whitney was taught about the bystander effect in her social psychology course and she was inspired to undertake an undergraduate research project on this subject.
Explanation:
A baby's father is playing with the baby and is also exercising his limbs. The father also changes the baby's diapers. While the mother feed the baby and also makes the child sleep by singing songs and reading stories.
This is typical in the sense that the father is engaged in more high-intensity play with the child while the mother is engaged in giving more comfort to the child and is care giving.