According to some authors, aquatic environment offers advantages for motor development, which can be used from the first months of life. The current research reviewed support physical exercise in water is favorable for the neurodevelopment of the baby. At present there are few studies with a scientific methodology that have developed a physical activity programme in babies in the first 3 years of life. Therefore, in this study, an aquatic physical activity programme will be performed to check

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... w it affects the sensorymotor development and affectivity of healthy babies in their first years of life. Objectives: To determine the relationship between physical activity in water and the development of psychomotricity in healthy babies in their first three years of life. Material and methods: A case-control study was accomplished with 74 infants in the intervention group and 71 in the control group. The programme is carried out twice a week and lasts for 20 min in the water. It starts at 3 months and lasts three years of age. The activity is performed in the therapeutic swimming pool of the Complejo Hospitalario Universitario of Granada. In the first trimester, between the 3 and 6 months of life, we join in the adaptation to the aquatic environment, the interrelation between the babies and their parents, the first motor skills, supine and prone positions, flips and the beginning of sedestation and dives. In the second trimester, between the 6 and 9 months of life, we intervene on displacements and crawling. And in the third quarter, between the 9 months and the first year of life, we participate on the equilibria-imbalances, displacements, standing, march and dips. The second and third year will be carried out group aquatic activities to encourage, through play, motor skills in the water. Expected results: Aquatic physical activity improves neurodevelopment, sleep and affectivity in healthy babies.