Add br tag after few anchor tags in jquery

I have following HTML:

<td class="sorting_1">
   <a href="/show/1">1</a>
   <a href="/show/2">2</a>
   <a href="/show/3">3</a>
   <a href="/show/4">4</a>
   <a href="/show/5">5</a>
   <a href="/show/6">6</a>
</td>

Output:

1 2 3 4 5 6

I want to have such that the <br> tag is added after 3 anchor tag, so the output looks like following:

1 2 3
4 5 6

How to do in jQuery?