Just for a quick fix, try wrapping your child elements into a div element like this -
<div id="outer">
<div class="divadjust" style="padding-top: 1px">
<div id="inner">
Hello world!
</div>
</div>
</div>
Margin of inner div won't collapse due to the padding of 1px in-between outer and inner div. So logically you will have 1px extra space along with existing margin of inner div.
