4.7.14 Wordpress 4.7 problem with contribution form Birth Date
Hi there there was an issue due to a change made in 4.7.14, It has been fixed in the up coming 4.7.15 version however I would suggest probably the better option is to upgrade and apply the following patch to your code base. https://github.com/civicrm/civicrm-core/pull/9530/