Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: Gassy baby...
Review: These create lots of tiny bubbles that my son swallows when he drinks from this top. It's a terrible design because the rubber on the back side covers the air vent and the spout so the air gets sucked into babies mouth instead of back in the cup. Boo! I was really excited to still use my Avent bottles to transition to cups, but this prodect doesn't cut it, I ended up buying other sippy cups.
