How can we get his Invitation or Visa ?

Hi
My Son is 1 year old on June 06, 2017 and I quite often travel to China for business. My wife also visited China with me for business. Now we want that we take our Son with us too during our business trip. How can we get his Invitation or entry permit ? OR shall i request my Chinese company to issue invitation for him too along with our invitations.

kindly guide.
regards
Muhammad Rehman