We've been playing around with the sippy cup since my DD turned 6 months (about 3 weeks now, but not every day). I usually just give it to her after her dinner time. Tonight she figured out how to actually drink efficiently from it. So now I'm wondering, how often do you offer it? I only put water in it.
Re: Sippy Cup
DD (5 years old) from IUI in 2012
TTC 3rd and final!: IUI #1 in progress!