title: Disabling first item to dropdown
body: <p>I have a lot of dropdowns and I would like to disable the first item, before I was trying to apply onClick, but won't work so well and now I am trying to disable using this way:</p>
  
  <pre><code> $("select option:first-child").attr("disabled", "disabled");
  </code></pre>
  
  <p>But won't work too, some idea?</p>
  
  <p>Thank you</p>