Thanks for sharing the data in your post. The story about amylaze is new to me.
However, I have learned from other sources that although the baby pancreas begins producing enzymes that break down starch to glucose (amylase) only around the age of six months, yet studies show that babies digest starch without problem.
why?
There are a number of reasons for this, especially since babies produce much more saliva containing amylase, and in breast milk there are some enzymes that the baby receives in the first months of life, even if he does not develop them himself.
The bottom line is that it is not recommended to prevent natural starchy food from babies, especially because of the need to display a wide variety of baby food and starch foods (potatoes, corn, beans, wheat, etc.) and cereal are not natural at all !