Here are the matches for the words with their corresponding definitions:
1 - D (a child that is less than four weeks old)
2 - G (being higher than usual)
3 - A (a pigment that can turn skin yellow)
4 - F (an irritated area of skin)
5 - C (the front, middle section of the body)
6 - E (the body's defense against infection)
7 - B (a disease marked by painful spots in the mouth)
8 - H (a treatment that involves exposure to lights)
If there are any adjustments or further clarifications needed, feel free to ask!