| Date | Event | Description |
|---|---|---|
| 5 March 2015 | New citation required but conclusions have not changed | For most of the primary outcomes results have not changed since the previous version. Effects on low birthweight, formerly borderline significant, are no longer so. |
| 5 March 2015 | New search has been performed | The review has been updated and a new author has joined the review team. Two new studies have been included (Korkmaz 2014; Liu 2012) and one study that was previously included has now been excluded after discussions among the review authors (Hemminki 1991). The review now includes a total of 61 trials. |
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