A nurse is performing a well-child assessment of an 11-month-old infant. Which parental statement requires immediate communication to the pediatrician?

A. "My baby does not sit without support.": While independent sitting is typically achieved by 6–8 months, a delay may warrant monitoring but is not immediately urgent at 11 months. Some infants reach motor milestones slightly later, and further assessment can determine if intervention is needed. B. "My baby does not respond to their name.": Lack of response to name at 11 months is concerning for possible hearing impairment or developmental disorders such as autism spectrum disorder. Early identification and referral are crucial for timely evaluation and intervention to support communication and social development. C. "My baby prefers to play alone.": Solitary play can be part of normal temperament, especially in short periods, and does not immediately indicate a developmental concern. Observation over time is usually sufficient unless combined with other red-flag behaviors. D. "My baby wakes once at night to feed.": Waking once at night for feeding is within normal sleep patterns for an 11-month-old. This does not pose a developmental or health risk and typically does not require urgent intervention.