At about what age do you all introduce cups with no lids?
I have a group of 12-15month olds right now that all use a spill proof straw cup for water throughout the day. A few are now okay to start some cows milk here at daycare. I don't feel like using the straw cups as I'll have to wash them more. I don't want to buy more of the cups as they were $8 each and won't be used long enough to justify buying a whole second batch.
I am contemplating using open cups for milk at lunch. I'd only give about an ounce of milk and I would do hand over hand until they manage on their own. Is this worthwhile at 12months? Or am I just making a lot more work/mess for myself?