<input class="childdob dateinput datepickers hasDatepicker valid"
placeholder="Date of Birth*" name="child_dob[0]" type="text">


$(function() {

        $('form').on('focus', '.datepickers', function(event){
            event.preventDefault();
                 $(this).datepicker( {
                    changeMonth: true,
                    changeYear: true,
                    yearRange: '1990:+0',
                    showButtonPanel: true,
                    dateFormat: 'mm/dd/y',
                    constrainInput: false
                }).datepicker('show');
        });

    });