The clinic nurse talks with the parent of a child with Down syndrome. The parent states, "I thought my 1-year-old would be walking by now. I am concerned." What response by the nurse is best?

"Milestones are often delayed for children with Down Syndrome."

"We should ask a physical therapist to address your concern."

"How many other children do you and your husband have?"

"How old was your child when he or she first begin to smile?"