A nurse is caring for a 2-year-old child who is hospitalized and throws a tantrum when his parent leaves. Which of the following toys should the nurse provide to alleviate the child's stress?

The posterior fontanel, located on the back of the head, usually closes by the age of 2-3 months. By 6 months of age, it is expected to be closed.

By 6 months of age, infants typically do not have their lateral incisors. The primary incisors, which are the central incisors in the lower and upper jaw, usually erupt first around 6-10 months of age.

At around 8 months of age, most infants are able to sit steadily without support. They can maintain an upright sitting position and may even start to reach for objects or play in a sitting position.

At 6 months of age, infants are still in the developmental stage of exploring objects and refining their motor skills. They typically use a palmar grasp, where they grasp objects with their entire hand. The pincer grasp, which involves using the thumb and index finger to pick up small objects, usually develops around 9-10 months of age.

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.