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?

Choice A reason: Mouthing objects is normal at 4 months, aiding exploration and teething. It’s developmentally appropriate, not requiring provider notification at this stage.Choice B reason: Anterior fontanel closure before 9-18 months may signal craniosynostosis, affecting brain growth. This premature finding warrants urgent provider evaluation.Choice C reason: Rolling back to abdomen is a 4-6-month milestone, expected here. It’s a healthy motor development sign, not needing provider attention.Choice D reason: Posterior fontanel often closes by 2-3 months, normal at 4 months. This aligns with typical infant skull development, not a concern.