Nelson’s description mostly just reads ‘autism spectrum’ to me. (High prior probability unlike WS, poor theory of mind, literalness, gullibility, small/weak/poor health, all pretty ordinary, nor is facial oddness odd for many genetic/developmental disorders including all of the autisms.) Williams Syndrome is very different, to the extent that people sometimes try to describe it as ‘the opposite of autism’, which illustrates the hazards of trying to make diagnoses online based on cursory information...
Nelson’s description mostly just reads ‘autism spectrum’ to me. (High prior probability unlike WS, poor theory of mind, literalness, gullibility, small/weak/poor health, all pretty ordinary, nor is facial oddness odd for many genetic/developmental disorders including all of the autisms.) Williams Syndrome is very different, to the extent that people sometimes try to describe it as ‘the opposite of autism’, which illustrates the hazards of trying to make diagnoses online based on cursory information...