DHA supplementation can be started during the fifth month of pregnancy. After the fifth month of pregnancy, the fetus’s sense of hearing, vision, touch and so on are developing faster, which belongs to the critical period of development. Timely supplementation of DHA at this time can promote the development of the fetus’s optic nerve and intelligence. There is no recommended dosage for DHA supplementation. Pregnant women can take DHA supplementation at the right time according to the instructions of the medication, but they should pay attention to the reasonable intake of DHA because excessive intake of DHA will produce a series of side effects such as low immunity. Five months is the period of the greatest demand for DHA, so you should start supplementing DHA from the fifth month of pregnancy, if you have questions about the drug, you can visit the hospital for advice.