TalkTools Honey Bear Silicone Straw Cup, Dishwasher Safe Baby Drinking Bottle, Premium Food-Grade Material, Honeybear Sippy Cup for Ages 4+ Months, Kids and Toddlers (Single 8oz) (Sage)

We also struggled a lot with sippy cups but noticed that she would take to straws a lot more intuitively. This is the one we're using with the best results. I have no idea if this is the best brand or the veracity of its claims about developing oral-motor skills. I just know she drinks more readily from this than anything else we've tried. TalkTools Honey Bear Silicone Straw Cup