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A fifteen-month-old baby can usually say five or six words with understanding and easily follow simple instructions. Speech depends to a considerable extent on the parents' genetic makeup. Thus, some babies speak very well at fifteen months while others say no words at all. Considering the parents' characteristics as babies allows a more accurate assessment.
At this stage the baby gradually begins to object to the family and to their parents. They may suddenly become angry while eating, spill food or throw something they are holding onto the floor. They may occasionally show irritability or have outbursts of anger. These are physiological characteristics and signs that everything is going well.
A fifteen-month-old baby's medical examinations usually involve a lot of crying. During examinations at this stage, the baby may react even to a doctor they have known since infancy.
