Ds was simply very uninterested in nursing, at least during the day, from 10-13 mo. From then until now with verbal milestones and teething, it's like having a newborn again. I can't remember what he did to ask. I think it was pulling at my shirt, usually in the grocery store. At 16 mo he finally started signing milk back to me. Then he called it milk, then nurse, and now at 26 mo it's 'have boobies!' I made the mistake of calling my breasts boobies when he pointed to them and asked 'is?' one day. He's very clear about it, too.