The baby goes to sleep practically all night long. During the day is more active. I smiled a lot. The mouth remains the center of knowledge. It follows objects visually up to 180 degrees. Try to pick up suspended toys and can pass them from one hand to the other. On his stomach, his head is steadily more and more balanced. Begins to lift the chest. The hands should open, which is a good sign of development. "Children with brain problems do not open their thumbs," says neuropediatrician Luiz Celso Vilanova. The fourth month brings a lot of news: the baby cries when left alone, likes to play hide and seek with the mother who covers her face with her hands, explores her body, taking her foot or her genitals. Touching his heels indicates that he begins to use his leg muscles. "A workout that will be required later on crawling and walking," says Lembo. Language advances with the perception of syllables and words. The baby notices that the sounds are accompanied by the movements of the speaker's mouth.
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