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?

A. Children with Down syndrome often experience developmental delays, and explaining this helps reassure the parent. B. While a physical therapist may be helpful, the nurse should first address the parent's concerns with information. C. Asking about siblings does not address the parent's specific concern. D. Asking about other milestones may shift focus away from the parent's immediate worry.