[jQuery] .attr not working

[jQuery] .attr not working


if($('input.student_check:checked').length > 0)
        {
            $('#birth_date').removeClass('hide');
            $('#birth_date').attr('disabled', '');
            $('label[for=birth_date]').removeClass('hide');
        }
        else
        {
$('#birth_date').addClass('hide');
            $('#birth_date').attr('disabled', 'disabled');
            $('label[for=birth_date]').addClass('hide');
        }
the first .attr that removed the disabled works fine but the second one does
not work, it does not get added back, anything wrong with my code?
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