/**
* Inserts the given $child node as first child of current
* The modifications in the current object and the tree
* are not persisted until the child object is saved.
*
* @param Especialidad $child Propel object for child node
*
* @return Especialidad The current Propel object
*/
public function addChild(Especialidad $child)
{
if ($this->isNew()) {
throw new PropelException('A Especialidad object must not be new to accept children.');
}
$child->insertAsFirstChildOf($this);
return $this;
}