I’ve written before about my belief that male circumcision should be outlawed (unless really medically essential) — see inter alia here and here.
Well this peer reviewed paper looks like another damn good reason not to circumcise boys.
Morten Frisch & Jacob Simonsen, “Ritual circumcision and risk of autism spectrum disorder in 0- to 9-year-old boys: national cohort study in Denmark”, J R Soc Med OnlineFirst, 8 January 2015.

Abstract
Objective: Based on converging observations in animal, clinical and ecological studies, we hypothesised a possible impact of ritual circumcision on the subsequent risk of autism spectrum disorder (ASD) in young boys …
Participants: A total of 342,877 boys born between 1994 and 2003 and followed in the age span 0–9 years between 1994 and 2013.
Main outcome measures: Information about cohort members’ ritual circumcisions, confounders and ASD outcomes, as well as two supplementary outcomes, hyperkinetic disorder and asthma, was obtained from national registers. Hazard ratios (HRs) with 95% confidence intervals (CIs) associated with foreskin status were obtained using Cox proportional hazards regression analyses.
Results: With a total of 4986 ASD cases, our study showed that regardless of cultural background circumcised boys were more likely than intact boys to develop ASD before age 10 years … Risk was particularly high for infantile autism before age five years … Circumcised boys in non-Muslim families were also more likely to develop hyperkinetic disorder … Associations with asthma were consistently inconspicuous …
Conclusions: We confirmed our hypothesis that boys who undergo ritual circumcision may run a greater risk of developing ASD. This finding, and the unexpected observation of an increased risk of hyperactivity disorder among circumcised boys in non-Muslim families, need attention, particularly because data limitations most likely rendered our HR estimates conservative. Considering the widespread practice of non-therapeutic circumcision in infancy and childhood around the world, confirmatory studies should be given priority.