What milestone is expected around 4 months concerning head control when being lifted?

Around 4 months of age, one of the key developmental milestones related to head control is the ability to exhibit no head lag when being lifted. At this stage, infants typically have developed sufficient muscle strength and control to keep their heads steady and aligned with their bodies when they are pulled to a sitting position. This improvement in head control indicates significant growth in core strength and motor development.

Having no head lag means that when the child is lifted or pulled upright, their head maintains an upright position rather than drooping back or lagging behind their body. This milestone is crucial as it lays the foundation for further developments in gross motor skills, such as sitting independently and eventually crawling and walking. In contrast, the other options describe scenarios that are not aligned with what is expected at 4 months of age, such as inconsistent or excessive head movement, which would indicate underdeveloped neck and shoulder muscles.