When our first daughter was turning 1, she's now 4 1/2, our day care provider told us she was to young to move to a sippy cup - she wouldn't get enough fluid from it. She shared that she had experienced the same thing. We didn't believe her. We started Josephine out with a soft "nippled" sippy cup that I think Nuby makes. It was shaped similar to a bottle, and had the same feeling as a nipple. It's not very spill proof, but it worked very well. We slowly transitioned her to other cups to see what was best, with the hopes of finding something spill proof. Eventually we found several that worked. Our younger daughter moved to solid foods and sippy cups at roughly 9 months of age with no difficulties. She suffered from reflux and the doctor thought that if we could get her on solids earlier, the disease would clear up. I wouldn't begin to say that your son is to young for a sippy cup, but I will say it appears that infants/toddlers transition at different ages and go through different stages of getting there. I'm also in GR.