Financial requirements for dependents visa on flr(m) form

Hello to all!!! I know there are many expert immigration advisers and gurus on this forum. I need your expert advise because I am confused about the financial requirements for dependent visa on flr(m) form.
About me I am on ILR and want to apply for my wife visa for extension as a family member living permanently in UK. I know the financial requirement is 18600 per annum for applying without a child. I have a son and already applied for registration as a british citizen for him and waiting.
Now my question is that if I apply for my wife visa on flr(m) what would be my financial requirement for that it would be 18600 pounds applying without a child or it would be 22400 for applying with a child because my child is not british citizen yet.
I need your advise before apply for my wife visa.
Please! Any gurus! Please help me to sort out the problem.
Looking for your expert advise.
Thanks

If your child is not yet a British citizen it would be £22,400.