Neurodevelopment - https://www.youtube.com/watch?v=VcqVJy2l1B4

Piaget's stages of cognitive development - https://www.youtube.com/watch?v=Jt3-PIC2nCs

The Study of Cognitive Development in Understanding Child Development - https://www.universalclass.com/articles/psychology/child-development/the-study-of-cognitive-development-in-understanding-child-development.htm

Cognitive Development: Preoperational Stage - https://www.youtube.com/watch?v=sq1vMELzJZA