During the process of synaptic pruning:

"Neural connections in the brain are cleared away."

Explanation:

"Synaptic pruning" does not refer to motor milestones. Motor milestones are normative physical behaviors a child exhibits during growth and development. Synaptic pruning is referring to the process in which certain unused neural connections, or unused synapses, in the brain are eliminated, while others remain. This has been thought to be a response to learning and forming stronger neural connections with some neurons as a consequence; however, this is also a normative process that occurs in children as a part of human development in which there is a gradual reduction in synapses.