At 4 months of pregnancy, you are already doing the right thing by taking folic acid, which supports your baby's early brain and spine development. As the pregnancy progresses, your body and your baby need a few more nutrients for healthy growth. Doctors commonly recommend iron to prevent anaemia and support your baby's blood supply, calcium for strong bones and teeth, and vitamin D to help your body absorb calcium properly. DHA (a type of omega-3 fatty acid) is also often advised because it supports brain and eye development. Some women may also need vitamin B12, especially if they follow a vegetarian diet. In many cases, these nutrients are given together as a prenatal supplement, but the exact combination and dose depend on your individual needs. Along with supplements, eating a balanced diet with fruits, vegetables, proteins, dairy (or alternatives), and plenty of fluids is very important. It is best to follow your doctor's advice before starting anything new, so you get the right nutrients in safe amounts for both you and your baby.