To assess the head control of a 4-month-old infant, the nurse lifts up the infant in a prone position while supporting his chest. The nurse looks for what normal response? The infant:
a. Raises the head, and arches the back.
b. Extends the arms, and drops down the head.
c. Flexes the knees and elbows with the back straight.
d. Holds the head at 45 degrees, and keeps the back straight.
ANS: A
At 3 months of age, the infant raises the head and arches the back as if in a swan dive. This response is the Landau reflex, which persists until 1 years of age (see Figure 23-43). The other responses are incorrect.
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