Alhamdulillah, congrats on planning for baby number two! Memang penting start thinking about nutrition sekarang, a few of us yang planning juga increase folic acid intake dulu (through greens, beans, fortified cereals) sebab tu help reduce birth defects, and make sure calcium, protein, iron pun adequate for conception and early pregnancy. Most important lah, make sure you're at a healthy weight dulu if boleh, get regular check-ups with your gynae, and avoid stress sebab that affects fertility juga. I'd say start taking prenatal vitamins dengan folic acid already, and maintain balanced diet with plenty of fruits, veg, lean protein, nothing fancy, just consistent healthy eating. Wish you all the best!