NUTRITION WITH COMPLEMENTARY FOOD   Whether a baby is fed only with breast milk, drinks formula, or is fed both breast milk and formula, it is beneficial to switch to complementary feeding on the 180th day. Here, the process of consolidating the tight junctions between intestinal cells is only completed. In other words, all babies are born with a physiologically more permeable intestine. This may cause unwanted products to mix with the blood. However, according to basic biological knowledge, the intestines are selectively permeable. So the intestines must decide who gets into the blood. For this, the control gate must be in control. Moreover, the enzymes secreted from the stomach and pancreas are insufficient until then and can best digest breast milk or formula milk. When poorly digested proteins enter the blood, they can trigger allergy mechanisms. Whatever liquids were fed until the end of 6 months, solid foods are started during the supplementary feeding period in order to complete those liquids. For this reason, this period is called the complementary feeding period. When starting these foods, liquid nutrition is not reduced but added to it. However, this period is not the time to fill your stomach with solid foods. It is the tasting period. Tasting is not used only in the sense of palatal pleasure. The purpose of tasting is to process the information that has been foreign to the body slowly and not to cause undesirable reactions. For this reason, it is a rule that the food tasted for the first time should be tried from less to more in the first three days, and that new food should not be introduced as long as these trials continue. Give one baby spoon on the first day, two baby spoons on the second day, three baby spoons on the third day, etc. On the fourth day, if there is no vomiting, redness, rash, swelling of the eyelids or lips, a small Turkish coffee cup can be given. On the same day, you can try the first spoon of the new food to be introduced. Progress is made slowly by making additions like this. As the sixth month progresses to the seventh month, it is recommended to try seasonal vegetables and fruits, and if there is no allergy, yoghurt and egg yolk fermented from cow, goat or breast milk. When trying egg yolk for the first time, first feed it with the tip of a teaspoon, then a quarter, then half, and then at the end of a week, feed the whole egg yolk. If no allergic reaction is observed, you can safely eat one egg yolk every day. In order to prevent constipation and increase their nutrition, extra virgin olive oil, which is not older than 6 months and stored in a dark-colored bottle with a lid, should be added to vegetables. As you move from the seventh month to the eighth month, it is recommended to add minced lamb, village chicken, sea fish and lamb liver every week, and enrich it with lamb marrow and bone broth. When the eighth month is completed, grains, legumes, nuts and spices should be added. Adding grains earlier may cause constipation, and adding them later may cause digestive sensitivities. Egg white can be added after the ninth month. In complementary feeding, the number of meals should not exceed 2 days until the 9th month, and the total daily amount should be a maximum of two tea glasses. After 9 months, the number and amount of meals can be increased to three. Meals do not need to be named breakfast or lunch. Feeding should be offered as soon as the mother and baby are open to this experience. Water drinking should also be offered along with complementary feeding. Boiled and cooled water should be preferred. Foods that are not recommended to be given until one year of age include honey with the risk of botulinum toxin, animal milk with the risks of loss of appetite, anemia, allergies and constipation, salt and sugar, packaged foods, processed meat products and frozen foods. It is also recommended to try mushrooms and eggplant after age.