They start being independent.

They begin to crawl, to eat with help, then alone, until they walk and begin to become independent and there you realize that they are not yours, that life I lend to you so that you will raise them and take them on the right path, until they leave you. side and walk the same path that you have already walked. They are a miracle, a love, that is the children.

A little picture after having crawled enough.