Welcome to Part 9 of my Baby Temperament and Sleep Series. If you are just joining us, you may want to start with Part 1, where I define baby temperament. This article will discuss your baby's first reaction as a baby temperament trait. At the end of the series, I will give you a quiz to determine your child's temperament. Baby Temperament - First Reaction When a person is presented with a new food, idea, social situation, person to meet, or a new place to visit, some people will jump