I love breastfeeding my son and I've been doing this exclusively for 101/2 with no formula as…

I love breastfeeding my son and I've been doing this exclusively for 101/2 with no formula as supplement. But now Ethan wants the boobs all the time and it has become a prisoner. He wants it when he's happy, sad, cranky, hungry, full, before bed, and after bedtime or nap. Need to set limits but don't know how. Right now he's sleeping with the boobs and his blankie and I cannot take it out.