I got these bottles in a chicco set when my son was born. They were amazing to switch onto once I stopped breast feeding. The teat is curved and shaped like a breast so my son took to it with no problems at all. Prefer these to tommee tippee now.
When my baby was just a few days old I used this all the time with my expressed milk, being so small and easy to hold was a big advantage, also, the angled teat helped my baby very much as in his first 3 weeks had very bad colics, now he is much better and I tend to believe that the Chicco bottle had something to so with that.