Changes to the child's thorax from 3 to 6 months of age include which of the following?

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During the first 3- to 6-month period of development,a child is beginning to reach and use the upper extremities,causing strengthening of the anterior chest wall and intercostals.This allows for expansion of the ribs in the lateral plane as well as better resistance to gravity in the anterior plane.The child is able to better breathe in multiple planes of movement.With strengthening of the anterior wall,there is also better strength of the posterior spine stabilizers,causing a slight reversal of the concave posture initially seen.

Changes to the Child's Thorax from 3 to 6 Months