Quote Originally Posted by iCake View Post
Don't see anything bad in my sentence. As it-ogo said it may be better to omit себя but it's still not required. As for Он заставил своего ребёнка ждать ЕГО That's really nonsense. Because the question arises immidiately.

Кого его? Because его doesn't refer to the subject, which is он, but refers to somebody else and that somebody isn't mentioned
As long as we have only two persons in our sentence any ambiguity is ruled out. You are correct that that somebody isn't mentioned, hence, it would be incorrect to refer to someone who hasn't been mentioned. In this case the only pronoun which can refer to "его" is "он", which is the subject of the sentence.