and cute to boot! We love these bottles. I spent countless days looking for bottles for the new baby and settled on these. I have used Avent with my first for the occational bottle (breastfed baby) did great with these and the Green To Grown bottles are very similar and they DO NOT LEAK!. The wide neck also attaches to my breast pump and I can store the milk in the bottle using the sealing disks, pop nipple in, warm, and feed baby, very useful and we do not have to waste storage bags. They are also interchangeable with Avent nipples. Overall I love these and would pay this much for the all over again. My son has taken well to them and we have had no issues with nipple confusion.
Also.. since they are the same size mouth as Avent, you can use the Avent adaptor for breast pumps when using a narrow mouth pump (such as medela, lansinoh..)
UPDATE! We have been using these for almost 3 months on a daily basis and they have yet to leak. The really wash well and feel so sturdy. It is so nice to only have 3 pieces to wash and not have a gassy baby :)