We use the Born Free Sippy cups. They've been great. I also like that you can buy the trainer cup spouts to change out. They're made of a stiffer plastic to more mimmic a real cup. They're also great for teething.
We use the take n toss by First Years. They're simple, cheap and DD does well with them. After spending a lot of time over the months with complicated bottles (Born Free - love em!), it's nice to have a simple sippy.
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Re: Recommend your sippy cup!