What is one of the health issues that families control regarding child well-being?

The correct choice highlights one of the significant aspects of health management that families can influence when it comes to their child's well-being. Frequency of doctor visits is a direct reflection of how families prioritize and manage their child's health care. Regular check-ups are essential for monitoring growth and development, preventing illnesses, and identifying any potential health issues early on.

When families actively control the frequency of these appointments, they are advocating for their child's health and ensuring that they receive necessary vaccinations, routine screenings, and developmental assessments. This proactive approach helps families stay informed about their child's health needs and fosters a supportive environment conducive to overall well-being.

The other options, while related to child well-being, pertain to family routines and activities rather than direct health management practices. Bedtime routines can impact sleep quality, indoor play activities are vital for physical and cognitive development, and the use of electronic devices has implications for monitoring screen time and its effects on health. However, none of these aspects exert the same level of direct control over health outcomes as the frequency of medical appointments does.