3 ms·

I think the age of the father may also have something to do with it.

• douche 11y ago
  It appears that that is true, although all I can find is this abstract[1], and it sounds like it might have as much to do with both parents being older. In general, it appears that waiting into your 30s or later to start having children is riskier than doing so earlier. It'd be nice if we could rejigger society to reflect that - if people had their children first and entered the workforce at 30, they'd still have thirty or so productive years. [1] http://www.ncbi.nlm.nih.gov/pubmed/12771769 http://www.ncbi.nlm.nih.gov/pubmed/12771769