Cakephp 4.x : reset form after submit

Dear all,

I want to add many records one by one.
I have an Add form, and want to comeback after Submit, however, the form is full of previous data.
I have search but did not find solution.
I tried creating empty entity for the form, but it seems not enough, people say that I have to clear request data. But I dont know how.
Below is my Add action in Controller

public function add($parentID = null)
    $kid = $this->Kids->newEmptyEntity();
    if ($this->request->is('get')) {
        $pageReferer = $this->referer();
    if ($this->request->is('post')) {
        $kid = $this->Kids->patchEntity($kid, $this->request->getData());
        $icsParent = $this->IcsParents->get($this->request->getData('parentID'), ['fields' => ['id', 'family_id']]);
            if (is_null($icsParent->family_id)){
                //create family
                $family = $this->Kids->Families->newEmptyEntity();
                $family->consultant_id = $this->Auth->user('id');
                if ($this->Kids->Families->save($family)){
                    $icsParent->family_id = $family->id;
                    $kid->family_id = $family->id;
            } else {
                $kid->family_id = $icsParent->family_id;
        if ($this->Kids->save($kid)) {    
            $this->Flash->success(__('Đã thêm bé vào Family.'));
            if ($this->request->getData('submit') == 1) {
                $kid = $this->Kids->newEmptyEntity();
                $pageReferer = $this->request->getData('pageReferer');
                //$this->request->withoutData('kid'); // I dont know what this statement do, just try
            } else {
                return $this->redirect($this->request->getData('pageReferer'));
        } else {
            $this->Flash->error(__('Không thể thêm bé vào Family.  Vui lòng kiểm tra các thông tin nhập vào.'));
    $nationalities = $this->Kids->Nationalities->find('list', ['limit' => 200]);
    $eduTypes = $this->Kids->EduTypes->find('list', ['limit' => 200]);
    $this->set(compact('kid', 'parentID', 'nationalities', 'eduTypes', 'pageReferer'));

Can you paste controller code ?

I update the Controller code in my question for your info.

Please help!
Thank you very much.

You can try redirect to add method after saving data.
return $this->redirect(['action' => 'add']);
Hi, người Việt Nam.