I wean at 4 months. You can wean as early as 3 months as long as the baby is eating grain and hay consistently. At three months, mama's milk isn't very nutritious anymore and nursing is mostly for comfort. I feel it's okay for them to continue to have that comfort until 4 months! There have been studies, can't remember the website, that show that babies who are weaned at three months and given good grain are healthier than babies weaned later....