Hi. I bought a children's bottle with this cap. I am very dissatisfied and wonder if I was supplied with a faulty cap and should order a replacement, or if it is a poor design. Only a little water comes out when you suck, it's mainly air that gets sucked into your mouth. It also leaks completely, not only does it drip, but water flows out. No matter how the straw is placed. There are reviews here that confirm this, but also some that say it's perfect and leak-proof. What is the truth now? Did I buy a model that came from a junkyard and is it worth buying a replacement? Thank you!