Many preschool children tend to be egocentric. They only hear themselves. The speech of the child is aimed at an internal dialogue with his person.
With the advent of a baby in the family, adults do their best to guess and satisfy all the requirements of the little man in order to create comfortable conditions for his life and development. And this is correct, but it does not always work out and not for everyone: the smaller the peanut, the more difficult it is to understand what worries him and whether he worries at all.