The answer is that I really don't know when.

Babies that are breastfed for longer than six months are less likely to develop mental health problems in childhood, new research shows. So far Jonas and I are on the right track.
I am glad that I made the decision to nurse my little man, especially if it will help him mentally. I was reading how infant psychotherapy is on the rise. Many parents are seeking therapists to help with their baby's mental health.
This sounds so scary to me. I would hate for my Jonas to have any mental problems growing up, let alone as a baby. If continuing to breastfeed for longer than six months is what I have to do to help in some way, then that is what I shall do.
"The team at the Telethon Institute for Child Health Research in Perth found that breastfed children had particularly lower rates of delinquent, aggressive and anti-social behavior, and overall were less depressed, anxious or withdrawn."
The American Academy of Pediatrics is a strong advocate for breastfeeding and they state the many great things that a mother's milk can do for her baby.

They say breastfeeding:
I have read that it is important to begin weaning when Jonas and I are both ready. Of course I am just waiting for him to give me signs of his readiness, but I am not rushing him at all. Whenever my gordo is ready, then that is when I will be.
For now, I'll just continue to boost his brain power with my magical breast milk.