Consider the following patient scenario: A mother comes in with 9-month-old girl. The infant is 68.5cm in length (25th percentile per CDC growth chart), weighs 6.75kg (5th percentile per CDC growth chart), and has a head circumference of 43cm (25th percentile per CDC growth chart). Describe the developmental markers a nurse should assess for a 9-month-old female infant. Discuss the recommendations you would give the mother. Explain why these recommendations are based on evidence-based practice.


Assessing the developmental milestones in infants is an essential aspect of pediatric nursing. It allows nurses to monitor the growth and development of infants and detect early signs of potential developmental delays or concerns. This paper will describe the developmental markers that a nurse should assess for a 9-month-old female infant. Additionally, recommendations will be provided to the mother based on evidence-based practice.

Developmental Markers for a 9-Month-Old Female Infant

At 9 months of age, infants are expected to achieve several developmental milestones across various domains, including physical, cognitive, social, and language development. These milestones provide a framework for assessing and promoting the optimal growth and development of the infant.

Physical Development
Physical development in a 9-month-old female infant primarily involves gross and fine motor skills. The infant should be able to sit without support, roll over in both directions, and pull themselves up to stand while holding onto furniture or supports (Centers for Disease Control and Prevention [CDC], 2021). Gross motor skills also include crawling or scooting on their belly, as well as the ability to bear weight on their legs when supported in a standing position.

Fine motor skills refer to the development of hand-eye coordination and manipulation of objects. A 9-month-old infant should be able to pick up small items using their thumb and index finger, commonly referred to as the “pincer grasp.” They should also be able to bang objects together and hold their own bottle while drinking (CDC, 2021).

Cognitive Development
Cognitive development involves the infant’s ability to think, reason, and understand the world around them. At 9 months of age, a female infant should demonstrate increasing object permanence, meaning they understand that an object still exists even if it is out of sight. They may enjoy playing games such as peek-a-boo, which require an understanding of object permanence.

Furthermore, the infant should respond to their name and exhibit early problem-solving skills, such as figuring out how to remove objects from containers or placing objects inside them (CDC, 2021). They may engage in simple imitation, such as clapping their hands when they see others doing so.

Social and Emotional Development
Social and emotional development at 9 months involves the infant’s interaction with others, including the development of attachment and emotional expression. The infant should show signs of attachment to their primary caregiver and exhibit separation anxiety when the caregiver leaves their sight.

Moreover, they should respond to other people’s emotions and show some understanding of their own emotions. The infant may exhibit gestures such as waving “bye-bye” and recognize familiar faces (CDC, 2021). They may also start to imitate certain behaviors and actions of others.

Language Development
Language development at 9 months includes both receptive and expressive language skills. The infant should respond to simple verbal commands, such as “no” or “bye-bye.” They may also say their first recognizable word, such as “mama” or “dada,” although these early words may not have specific meaning attached to them.

Additionally, the infant should engage in babbling and imitate various sounds and tones. They may also demonstrate some understanding of simple gestures and use gestures, such as pointing, to communicate their needs or desires (CDC, 2021).

Recommendations to the Mother

Based on the developmental markers discussed above, several recommendations can be given to the mother of the 9-month-old female infant. These recommendations are grounded in evidence-based practice and aim to promote optimal growth and development.

Firstly, the mother should encourage and provide opportunities for the infant to explore their environment and engage in age-appropriate play activities. This may include providing safe and stimulating toys that promote both gross and fine motor skills, such as toys with buttons to press or objects to stack.