| A | B |
| infant | birth to age one |
| abdomen | stomach |
| siblings | brothers and sisters |
| large motor skills | walking, rolling over, sitting |
| small motor skills | cutting, drawing, writing, coloring |
| reflex | automatic reactions that we do not control |
| cognitive | learning, intellectual, having to do with the brain |
| emotional | having to do with feelings |
| physical | having to do with the body |
| social | having to do with how we relate to others |
| cooperative play | playing with another person |
| parallel play | playing alongside someone else, but not playing with them |
| solitary play | playing alone |
| toddler | between 2-3 years old |
| preschooler | 3-5 years old |
| adolescent | teenager |
| separation anxiety | fear that parents will not return after they leave |
| tantrum | when I child throws a fit |
| hazard | not safe |
| passive play | watching tv or videos, not taking an active part |