A community health nurse is making a family home visit. the family consists of the mother, father, a 1-year-old, and a 4-year-old. the mother tells you that the 4-year-old, who is in preschool, had a cold last week, and now the 1-year-old has it. she asks the nurse if she can use the over-the-counter cold medication that she gave to the 4-year-old for the 1-year-old. which response would be most appropriate