Leave aside the effect on the child (death) and the effect on anyone else (siblings, father etc) for a moment.
Let's just examine that claim. Because even the BBC admit in their report: 'The scope of the review excluded reactions such as guilt, shame and regret - although these were considered important - and also assessments of mental state within 90 days of an abortion.'
Although these are important, we will exclude them. Why?
For a comprehensive list of studies reaching rather different conclusions, visit John Smeaton's blog.