When you are pregnant your baby takes whatever he/she needs to grow from your body. You could be deficient in vitamins or minerals. Have you has your blood tested for complete blood count, mineral panel, and b-12? You probably still take the pregnancy vitamins? Maybe not helpful enough?
Also vitamin C, calcium, and Vit D would be good to add to prevent cold and such. I know you are breast feeding, so please ask your OB/GYN doctor what you can do to improve your health, and to better your chances of staying well. Just and idea.
May happiness be at your door. May it knock early, stay late, and leave the gift of good health behind.
"Life is what it is". We can only focus on controlling those things we can control, we must let go of the things we can't.