子供 | The usual word for child. $$$ |
童 | An archaic, literary/poetic word for child. Usually seen on CDs for children’s’ songs: 童のうた. |
児童 | A somewhat bureaucratic word for children. Usually seen on signs at the library:“Children’s’ room” or at city hall:“Department of Children’s’ welfare” or “child services.” |
児 | Infant. NUBI |
小児科 | Pediatrics. |