Question
What is the shape of just sprouted dwarf marigolds?

Answer
When marigolds first sprout, a set of two oval leaves will appear. These leaves will have smooth edges. These leaves are called the "cotyledons" (or seed leaves). They do not resemble the permanent leaves which follow later.

You can see a picture of a marigold seedling here:
http://img.photobucket.com/albums/v345/kdjoergensen/gardening/annuals/marigold4....

The bottom let of leaves are the Cotyledons (oval leaves). The upper sets of leaves with jagged edges are the permanent leaves.

Here is a picture of a marigold right after it broke surface:
<img src="http://img.photobucket.com/albums/v345/kdjoergensen/gardening/annuals/marigold1.jpg">

It only has two leaves which are oval shaped and smooth. These are the cotyledons.

You can view all 4 pictures here (they are all marigolds) :

http://smg.photobucket.com/albums/v345/kdjoergensen/gardening/annuals/