During the first trimester of pregnancy, it is important for women to consume essential foods to support the proper development of the baby. These foods include high-fiber fruits and vegetables, whole grains, lean proteins like poultry and fish, and dairy products for calcium. It is also recommended to include foods rich in folic acid, such as leafy greens and fortified cereals. Staying hydrated is vital, so drinking plenty of water is essential. It is advisable to consult with a healthcare professional for personalized nutrition advice during this crucial phase.