That's a great question! It's not quite accurate to say that cells themselves grow bigger to make a baby grow larger. Instead, the process is more about cell division and cell specialization. Here's how it works:

* Cell Division: A baby starts as a single fertilized egg cell. This cell divides repeatedly, creating more and more cells. This process is called mitosis.

* Cell Specialization: As the cells divide, they begin to specialize. This means they develop different structures and functions. Some cells become muscle cells, others become skin cells, nerve cells, bone cells, etc. This specialization allows different tissues and organs to form, giving the baby its body shape and functions.

So, the baby grows bigger not because individual cells get bigger, but because the number of cells increases through division and those cells develop into specific types with different functions.

Let me know if you have any more questions about cell growth and development!