At which age should a child be able to pull to sit without experiencing head lag?

A child typically develops the ability to pull to sit without head lag around 5 months of age. At this stage, infants gain improved neck and back muscle strength, which allows them to better control their head and maintain its alignment with their body when being pulled from a supine position to sitting.

At 4 months, while some infants may begin to show signs of developing strength in their neck muscles, many still exhibit head lag when being pulled to sit. By 5 months, most children have sufficiently developed the necessary muscle control, enabling them to sit up with their head coordinated and aligned, marking an important milestone in their motor development. Further development continues past this age, but it's specifically at 5 months that this skill typically emerges with consistency for most children.