Feeling weak while breastfeeding is common due to high nutritional demands. To regain strength, focus on a balanced diet rich in lean proteins (eggs, poultry, legumes), iron (red meat, spinach), calcium (dairy, leafy greens), and healthy fats. Stay hydrated by drinking plenty of water daily. For supplements, continue taking a postnatal multivitamin containing iron, calcium, Vitamin D, and DHA. Since postpartum anemia or Vitamin D deficiency often causes fatigue, please consult your doctor for a simple blood test to check these levels and ensure personalized advice. Avoid self-prescribing high-dose supplements.