| A | B |
|---|
| skeletal system | the body system that includes the bones and teeth |
| failure to thrive | a condition in which a child fails to grow at a healthy rate |
| body proportions | the relative size of body parts |
| ossification | hardening of bones caused by the depositing of the minerals calcium and phosphorus |
| deciduous teeth | the firsat set of teeth, which will later be replaced by permanent teeth. Also called nonpermanent, or baby teeth |
| motor development | the use and control of muscles that direct body movements |
| gross-motor skills | being able to use the large muscles to roll over, sit, crawl, stand, and walk |
| fine-motor skills | being able to use and control the small muscles, especially those in the fingers and hands |
| age norm | a range of ages at which average children reach developmental milestones |
| crawl | to move by pulling with the arms but not lifting the abdomen from the floor |
| creeping | moving by using the hands and knees or the hands and feet with the abdomen off the floor |
| cruising | walking by holding something for support |
| voluntary grasaping | the intentional grasping of objects |
