M.P.
I don't understand. How is the tubal ligation related to nursing? If you're wanting another baby so that you can once again try nursing him, I suggest that is not a good enough reason to have another baby. Nursing another baby will not give you back the time you lost with this baby. I suggest you need to deal with the issue of not having nursed this baby before you try to have another baby.
There are reasons that you had decided that you didn't want another baby and decided to have the tubal ligation. Revisit those reasons and be sure that you're wanting another baby for healthy reasons and not just to deal with the nursing issue.
You can bond with your baby without ever having nursed him. You really need to deal with the issues surrounding this baby before you consider having another one.