What developmental milestone should be occurring when a 4-month-old boy's spitting up symptoms resolve?

When evaluating the developmental milestones of a 4-month-old, it's important to consider the typical growth and development for infants during this stage. By the age of 4 months, many infants are refining their motor and physical skills, which includes gross motor developments.

The resolution of spitting up is often associated with improved muscle coordination and the maturation of the digestive system. Around this age, babies are starting to gain better control of their head and neck, and many begin to show signs of rolling over, which is a crucial milestone as it demonstrates increasing strength and balance.

While pulling up to a standing position typically occurs later, around 9 to 12 months, the ability to roll from a prone position (on their stomach) to supine (on their back) aligns well with what can be expected from a 4-month-old as they develop their gross motor skills. Additionally, babies can begin to roll over as their muscle strength increases and their coordination improves, making it a key developmental milestone at this age.

In contrast, assisting with dressing, eating with a spoon, and pulling up to stand all represent skills that develop later in infancy or toddlerhood, typically occurring after the age of 6 months. Therefore, the most relevant milestone when considering the context