The question here is infant and child psychology, and for that you need direct observation. Freud didn't do this, and he came up with an infant psychology that

The question here is infant and child psychology, and for that you need direct observation. Freud didn't do this, and he came up with an infant psychology that in key ways was simply wrong. The same is true of Lacan. Klein was a step in the direction. Part of the problem is that the needed scientific methods did not exist. But in recent decades they have been developed, and so we now have a vastly better understanding. And that in turn has enormous implications for psychotherapy. As to neuropsychology, I am not familiar with that field, so my question is what does it have to say about infant psychology.