I used these dummy's for the first 6 months. They do the job as long as you hold them in. Bubs found it difficult to keep the dummy in due to the flat teat shape. When she got bigger she managed to put the whole dummy in her mouth, it was stuck and needed me to retrieve it. After this scare I changed to a more traditional dummy and haven't had any issues with keeping the dummy in or it going in her mouth. Disappointed I didn't change brands sooner. I would not recommend these dummy's