87% of the women who did not breastfeed after pregnancy had relapses (one year follow up)
while only 36% of the women who did breastfeed exclusively after pregnancy had a relapse.
Can Breastfeeding Reduce Multiple Sclerosis Relapses?
Sixty percent of the women reported their main reason for not breastfeeding exclusively was to start taking MS treatments again.
Women who began taking MS treatments within the first two months after giving birth had significantly higher risk of suffering a relapse than women with MS who did not start taking medications early, regardless of whether they breastfed.
Another article, same news,
Breastfeeding "can reduce chance of multiple sclerosis sufferers having a relapse"
It's the initial study--but may help some with decision making.