Yes, the 1-2-3 Variflow teat should have a small slit between the small holes. Sometimes, the spontaneous opening of the slit can be mistaken for the teat tearing. If you only see 2 holes, it might be that the silicone material of the new teat is still sticking together. By pinching the top of the teat firmly or rolling it between your thumb and index finger. The silicone can separate, and the teat will function properly. You can also turn the teat inside out (and back). The slit can be opened manually a any time.