The mechanism of formation of immunity in a child is as follows. Nowhere in the genes is it spelled out which foods the immune system should react to and which not. Instead, a program is written in the genes that allows all possible antibodies to be generated once. And immediately after creation, they enter into a struggle both with everything that enters the mother's body, and with the mother's immunity itself. In the first case, maternal immunity helps the child's immunity, giving him the opportunity to fight, but not letting him lose the fight. This is necessary for the child's immunity to develop in general. In the second case, the mother's immunity (which is incomparably stronger) severely suppresses the attempts of the new immunity to fight something good. As a result, only those antibodies remain in the child's immune system that fight either something bad or something that has not yet been encountered. Moreover, the first ones have already managed to take part in some kind of struggle on the same side with maternal immunity, and therefore they are quite seriously pumped. The same antibodies that tried to fight against the mother's body itself were completely destroyed at the root. Not a trace of them remained.
So if a mother abuses some product during pregnancy, then, in principle, the child may develop an allergy to this product. But only when the mother herself has some weak form of the same allergy. In this case, the mother's immunity will actively react to this product, and the child's immunity, with the support of the mother, will be intensively pumped in the same direction. And it is possible that in the end it will pump even stronger than the mother. Especially if you really abuse this product. At least, maternal immunity will not suppress the development of the child's immunity in this direction, since he himself is broken and reacts to this product incorrectly.
No. Quite the opposite is true. A child's allergy can develop if a product is excluded. There are various Soviet myths such as "oranges will provoke toxicosis, you can't eat them." Some nasty doctor will forbid you strawberries. All this is fraught only with the fact that it increases the chance for your child to be allergic to these foods.
Evidence-based medicine has come to exclude only two products for all pregnant women: alcohol and caffeine. There is a myth about alcohol that is even a little useful. Again, in Russia there are enough miracle doctors who will advise you a glass of wine against pressure. Fuck a doctor like that. It has been proven that a certain proportion of alcohol increases the chance of developing pathologies in the fetus. But what exactly is this share - no one could calculate. Therefore, just in case, it is impossible at all. Nobody starts the harm at what dose - from the second glass, from the second sip or from the second drop of wine. Therefore, it is logical that any amount is prohibited. It is better known with caffeine. One cup of espresso or several large cups of weak tea will do no harm. These are the only two prohibitions that really help reduce the likelihood of your child developing abnormally. the rest are myths and idle conjectures of grandmothers, firmly entrenched in the mass consciousness, but without any foundation.
In other respects, pregnant women are advised to make the diet as varied as possible, eat small meals five times a day.