How to append element after first child div in jquery?

Question

Assuming I have the following divs:

<div id="mydiv">
 <div>1</div>
 <div>2</div>
 <div>3</div>
 <div>4</div>
</div>

How can I in jquery or javascript make it such that I can append an element right after the first child of "mydiv". Or is there some selector to allow me to select and append after the first child?

<div>
 <div>1</div>
 <div>Place to Insert Subsequent div</div>
 <div>2</div>
 <div>3</div>
 <div>4</div>
</div>

Answer 1

You can do this using :first-child and after:

$("#mydiv div:first-child").after(newDiv);

Demo