A baby’s IQ is usually determined by the genes of both parents.
Whether a baby is smart or not is not inborn, but there is a certain genetic factor. Both high and low IQ are determined by the genes of the parents, and at the same time, it has a great deal to do with the hard work of learning later in life.
Genetically speaking, the main key to a baby’s IQ lies in the mother, as the genes that determine the development of a child’s intelligence are located on the X chromosome. The genes on the mother’s X chromosome determine the degree of development of the child’s cerebral cortex, while the father’s genes are likely to have a significant impact on shaping the emotions as well as the type of personality of the offspring.
In fact, IQ innately should be at a comparable level for most people, in sync with human evolution, with acquired changes being a variable. So a child’s IQ, in general, has something to do with both parents, but it also requires acquired attention to later development and effort.