No. What makes it a human being is its DNA. In my previous example of the sster I never met born with the microcephalus defect (she died long before I was born), she was certainly human regardless of brain development. This argument is simply wrong and can be effetively shown to be wrong by this example. To define a human as only somebody with the correct amount of brain development is denying basic knowledge otherwise.
All of those things make it alive and reasonably responsive to outside stimulus, it can feel pain and react to it, it can even dream in one instance. Since brain development can obviously not be used to define a human being, unless you would wish to redifine my sister as something other than human, it would be wise to enter into a different defining moment of humanity.
In fact to define it as human life we need not even go into brain development at all or even reactive to stimuli, but can effectively determine if it is a human life at the Zygote level by showing it is alive and human by DNA. There is nothing else it will ever be but human, it is alive, therefore it is effectively human.