1. What can a four-month-old baby do? 1.1 Motor ability 1.2 Social ability 1.3 Language ability 1.4 Cognitive ability Four-month-old babies are in an important period of growth and development. They have begun to possess some basic motor, social, language and cognitive abilities. . At this stage, parents need to give them enough attention and care to help them grow better. 2. Movement ability