お兄さんと比べて、彼は運動神経が鈍い。
Compared with his brother, he is a poor athlete.

彼女は児童心理学専攻だ。
She majors in child psychology.

児童心理学者の中には、親はもっと子供と遊んでやり、考えさせる問題を与えてやるべきだ、と考える人が多い。
Many child psychologists think that parents should play with their children more often and give them problems to think about.