The nurse is assessing development of a 4-month-old boy during a well-child visit. Which observation needs further investigation?
a) The infant makes babbling sounds, coos, and smiles.
b) The infant shows interest in looking at near or high-contrast objects.
c) The infant responds to his mother when he sees her but not at other times when she is near.
d) The infant turns his head in the direction of a squeak toy.
Answer: The infant responds to his mother when he sees her but not at other times when she is near.