i'd say 2 and a half to three years old should be ok
I don't rememeber when my son stoped, but my daughter 2 days before she turned 3 she said she was a big girl and didn't want the sippy cup, she wanted a big girl cup. That was a sad few days for me, potty trained and sippy cup all gone in a matter of 4 days.
My oldest didn't ever use a sippy cup. She went to a regular cup nd cups with straws. My youngest used a sippy until she was 3.
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