Pregnant women can take linolenic acid at 3 months, because the brain and optic nerve of the fetus begin to develop after 3 months. Linolenic acid is an important substance to promote the development of the brain and optic nerve development, pregnant women can help the healthy growth of the fetus with a reasonable supplement. If a pregnant woman is deficient in linolenic acid, it will be extremely detrimental to the development of the fetal brain, so women should pay attention to the proper supplementation during pregnancy. You can start taking it after the third month of pregnancy to help the development of the fetal brain and optic nerve. However, it is important not to take the supplement blindly, but under the specific guidance of a doctor, in order to achieve the effect of safe supplementation. In addition, women should also be careful to control their diet during pregnancy, although linolenic acid is vital to the development of the fetus. However, care should be taken not to take too much, so as not to affect the intake of other nutrients, but also to the detriment of the healthy growth of the fetus.