A nurse is caring for a 6-month-old infant. Which of the following findings should indicate to the nurse that the client is experiencing pain following a procedure?

Lead is a toxic metal that can be found in old paint, dust, soil, and certain consumer products. Children are particularly vulnerable to lead poisoning, which can lead to developmental delays, learning difficulties, and other health problems.

Pesticides are chemicals used to control pests, such as insects and rodents. Children can be exposed to pesticides through contaminated food, water, or direct contact with treated areas. Pesticide exposure has been linked to various health issues, including neurodevelopmental disorders and respiratory problems.

Certain medications can be toxic to children, especially if taken in excessive amounts or without appropriate supervision. Accidental ingestion of medications, including over-the-counter and prescription drugs, is a significant concern in pediatric care.

While air pollution is a significant environmental factor that can impact children's health, it is not typically considered one of the most common toxins in pediatric care.

By 15 months of age, toddlers typically develop the ability to stand and maintain balance without support. This milestone is an important indicator of gross motor development. Not being able to stand upright without support at this age may suggest a delay or impairment in motor skills, and further evaluation may be needed to determine the underlying cause.

The other findings mentioned—difficulty jumping with both feet, inability to build a tower of six to seven cubes, and inability to turn a doorknob—are within the expected range of development for a 15-month-old toddler. While some children may already demonstrate these skills, others may acquire them later in their developmental journey. It is important to consider individual variations in development, but the inability to stand without support should be further assessed.