After the child is born, due to the development of the nervous system of the brain has a mature process, and physical development is very fast, infants and children in the process of growth and development will appear some drooling, growing pains and apnea and other phenomena, young mothers and fathers should pay attention to identify, so as to better home care, so that the baby grows up healthy. 1, drooling Saliva is actually saliva secreted by the salivary glands. The saliva not only has the role of wetting the mouth, dissolving food and facilitate swallowing, and can digest the carbohydrates in food, but also has a bactericidal effect to prevent the growth and reproduction of bacteria in the mouth. 3 to 4 months of age, the development of the salivary glands gradually mature, saliva secretion increased, but at this time the child swallowing saliva function is not yet sound, shallow mouth, lip closure and swallowing action is not yet coordinated, manifested as often drooling. After the child grows to 6-7 months, due to the stimulation of the nerves in the mouth by the erupting teeth, resulting in a large amount of saliva secretion, then the drooling will be more. Therefore, the above two situations belong to the normal physiological, not pathological, wait until the child gradually grows up, swallowing function development complete, this phenomenon of physiological drooling will disappear naturally. 2, leg bend Parents are sometimes surprised to find that the baby’s two little legs are a little bent inward, thought it was rickets. In fact, this inward bending of the legs is not rickets, but a natural physiological phenomenon. The reason for this is that the child’s body is in a state of flexion in the mother’s womb, so that the calves look a little bent for a while after birth. In addition, from the proportion of the baby’s body, the head is large, the upper body is longer than the legs, it looks like the two calves are short and bent. For this phenomenon of the two bent calves, as the child grows up will gradually correct itself. 3, hug reflex 3 to 4 months of age or less, when the mother or family members suddenly walk to the child or make a loud noise, you will find that the child appears two arms outstretched straight, and then flexed in front of the chest, in the shape of a hug, we will think that the child cramps. In fact, this is not a cramp, but a physiological phenomenon, medically known as the hugging reflex. If the lack of this hug reflex means that the child’s brain nervous system is not mature, the second may be the nervous system has damage or lesions, intracranial hemorrhage or other intracranial diseases. 4, apnea Careful mothers sometimes find that the newborn’s breathing is not only irregular, sometimes even apnea, and for this reason panic and anxiety. In fact, irregular breathing and apnea is a common phenomenon in newborns, especially premature babies, which is related to the immaturity of their brain nervous system development. Apnea usually does not exceed 10 seconds, and without any other discomfort, it can be considered a normal physiological phenomenon, no need to worry about. 5, growing pains Some children play well during the day, at night will complain of leg pain, parents carefully check the redness, swelling and other phenomena, the medical situation is called growing pains. The reason for this is that young children grow fast and overburden their legs, and the bone ends of the lower limbs become congested with blood, thus causing leg pain, which is also a normal physiological phenomenon. This kind of growing pain is characterized by mild swelling and pain in the calf, which is heavier in the afternoon and evening, but will gradually disappear as the child grows up.