| A | B |
| depth perception | The ability to recognize that an object is three-dimentional, not flat. |
| hand-eye coordination | The ablity to move hands and fingers precisely in relation to what is seen. |
| motor skills | Abilities that depend on the use and control of muscles. |
| primary teeth | The first set of teeth that a baby gets, which usually start to appear about six to seven months of age. |
| proportion | The size relationship between different parts of the body. |
| axon | The parts of the neurons that transmit instructions from the body of one neuron to another neuron. |
| cortex | Part of the cerebrum in the brain. |
| dendrite | The parts of neurons that receive messages from other neurons. |
| myelin | A waxy substance that coats axons, making it easier to transmit information from one neuron to another. |
| neurons | Nerve cells. |
| synapses | Gaps between neurons over which messages are sent between neurons. |
| shaken baby syndrome | A condition caused when a baby is severly shaken; can lead to brain damage. |
| weaning | The process of changing from drinking from the bottle or breast to drinking from a cup. |
| cradle cap | A skin condition of infants on which the scalp develops patches of yellowish, crusty scales. |
| diaper rash | Patches of rough, irritated skin in the diaper area. |
| sleeper | A one-piece stretchy garment with feet meant for an infant. |