Im so thin and im breastfeeding mom,what multivitamins should i take to gain my weight or to become fat?

One increases: calories to gain weight - one doesn't increase vitamins. Sleep at least 8 to 9 hrs/night. Hydrate well w water. Foods to help w healthy weight gain: almonds, cashews, pecans, sunflower seeds, flax seeds, walnuts, hummus, Avocados, granola, trail mix, dried fruits, extra virgin olive oil, canola oil, protein shakes, protein bars, lean meats, poultry, fish, Smoothies (w added silken tofu or powdered