i cannot help regarding the appendix C, i tried looking for it sa cic but I can't find it (help guys!) since the one we used during our application were the old forms pa, and the one's we are going to use for remedical were sent by the embassy.
anyway, regarding the medical fee, yung P5250 is for applicant from ages 15 and above, so the price of the medical exam for your kid depends kung saan age bracket siya included. like in our case, my kids ages are 2 and 4, so I have to pay P1875 each for them on top of P5250 I ahve to pay for myself. kindly check the link given to you again, it's there po.