GetComponentInChildren not Working

Hi, I got a script that instantiates a prefab each 20 seconds, and that prefab is supposed to choose a random sprite for itself and another for its child.

The thing is that it is getting his sprite with its random color but his child doesn’t even get its random sprite.

Both have a SpriteRenderer component attached and the parent has the script too, here is my code if someone can help me:

using UnityEngine;

public class BGTemplate : MonoBehaviour
    public Sprite[] upperPart;
    public Sprite[] bottomPart;

    private SpriteRenderer upperRenderer;
    private SpriteRenderer bottomRenderer;

    private float speed = 0.25f;

    (float, float, float, float) upperColor;
    (float, float, float, float) bottomColor;

    // Start is called before the first frame update
    void Awake()
        bottomRenderer = GetComponent<SpriteRenderer>();
        upperRenderer = GetComponentInChildren<SpriteRenderer>(true);

    private void Start()
        int randomSprite = Random.Range(0, upperPart.Length);

        bottomRenderer.sprite = bottomPart[randomSprite];
        upperRenderer.sprite = upperPart[randomSprite];

        upperColor = (Random.Range(0f, 1f), Random.Range(0f, 1f), Random.Range(0f, 1f), Random.Range(0.4f, 0.6f));
        bottomColor = (Random.Range(0f, 1f), Random.Range(0f, 1f), Random.Range(0f, 1f), Random.Range(0.4f, 0.6f));

        Color newUpperColor = new Color(upperColor.Item1, upperColor.Item2, upperColor.Item3, upperColor.Item4);
        Color newBottomColor = new Color(bottomColor.Item1, bottomColor.Item2, bottomColor.Item3, bottomColor.Item4);

        upperRenderer.color = newUpperColor;
        bottomRenderer.color = newBottomColor;

Are you sure, the spriteRenderer is Null? I would test, by writing Debug.Log(upperRenderer);

You could assign the childrens Sprite Renderer in the Unity Inspector, if make make it an [SerialzedField]. Would make better performance anyways…