A nurse is collecting data from a 4-month-old infant at a well-child visit. For which of the following findings should the nurse notify the provider?

A. Anterior fontanel closed. The anterior fontanel typically closes between 12 to 18 months of age. Closure at 4 months is premature and may indicate conditions such as craniosynostosis, which can affect skull and brain development. The provider should be notified for further evaluation. B. Moves objects to mouth. This is an expected developmental milestone for a 4-month-old infant. At this age, infants begin to grasp objects and bring them to their mouths as part of their sensory exploration. C. Rolls from back to abdomen. Most infants begin rolling from back to abdomen around 5 to 6 months. If a 4-month-old achieves this milestone early, it is not necessarily concerning but rather an indication of advanced motor development. D. Posterior fontanel closed. The posterior fontanel typically closes between 6 to 8 weeks of age, so closure by 4 months is expected and does not require provider notification.