"I breastfeed and I'll be breastfeeding until my son is finished and he weans," Morissette, 37, tells Access Hollywood.
Her decision, she adds, will provide her son with the stability he needs in his future. "I think it affords the child, when he grows up, to have a lot less therapy to go to," the first-time mom explains.
"For me, I protect his safety and his well-being and his attachment. That stage of development is a very important stage."