Pregnant women take dha specifically to a few months stop vary from person to person, and there is no very clear scientific evidence to determine. dha is a nerve cell growth and maintenance of a major component of the brain and retina is the main component, the theory is that can promote human nerve, brain development, so there are currently taking dha during pregnancy said. However, there is no authoritative guideline to confirm how much benefit the oral dha preparation for pregnant women can have on the fetus as well as the future brain and nerve development of the pregnant women themselves. Because after eating dha through the gastrointestinal tract of digestion and absorption and intake, whether it can achieve the role of promoting fetal brain development, is still unknown, so the specific pregnant women need to take as well as the specific eat to a few months, and there is no complete certainty that the statement.