Claim 1 in Dream Theory

As I mentioned before, Hobson pointed out three important factors of Freud's Dream Theory. Here is the first one again; 

1.) "that wishes are the instigators of dreams and in fact they are repressed infantile wishes" 

If anyone doesn't know, I am a huge fan of Freud's. However, so far I have not been able to completely agree or disagree with any one of his theories, I always end up with agreeing with this part, and disagreeing with that part, and so on. I have the same problem here. For example, I agree that our secret wishes, our hidden thoughts and desires, etc. which are usually repressed, are strong instigators of dreams. On the other hand, to suggest that they are repressed infantile wishes seems to me to be completely absurd. People dream of such extraordinarily complex things and situations, and things that in our infancy we couldn't even possibly know about. In our infancy we seem to only wish for very simple things, things to eat and drink, a warm soft place to sleep, room to play, and loving arms to hold us. I don't see how dreams about going to school in your underwear or falling down a flight of stairs or having sex, or being chased goes relate to infantile wishes. Now, I think many dreams do go back to childhood, even early childhood, but I think it would be quite a stretch to try to relate most common dreams all the way back to infancy.