HOW TO: jquery form - if option is selected slidetoggle div?

HOW TO: jquery form - if option is selected slidetoggle div?

Greetings,

I am trying to make a form that collects "Number of Children" a parent has. If they select "4" from the select input, then I want to slidetoggle out the appropriate divs, one for each child.

Code: 
<select id="NumberofChildren" name="NumberofChildren">
 <option value="0">0</option>
 <option value="1">1</option>
 <option value="2">2</option>
 <option value="3">3</option>
 <option value="4">4</option>
 <option value="5">5</option>
</select>






The div IDs to display are 1child, 2child, 3child, 4child, 5child.

I have been able to use slidetoggle in the past when attached to a button, but this one has me lost. Anyone know how to accomplish this? Your help is greatly appreciated! Thank you!