What is the first action a nurse should take after finding that an 8-month-old child's posterior fontanel is slightly open?

When assessing an 8-month-old child with a slightly open posterior fontanel, checking the child's head circumference is the most appropriate first action. The posterior fontanel typically closes by 2 to 3 months of age; however, if it is still open, it is important to evaluate whether the child's growth and development are within normal parameters. The head circumference measurement can provide crucial information about the child's brain growth and development. This is especially important because variations in head circumference can indicate potential developmental issues or concerns, such as hydrocephalus or other neurological conditions.

Monitoring growth trends is essential in pediatric assessments, and changes in the size of the head circumference can guide further clinical evaluation. By taking this measurement first, the nurse can establish a baseline for further assessments or consultations if necessary. Additionally, this action allows for immediate comparison of the child’s head circumference against growth charts, facilitating timely identification of potential problems.