I have bought these bottle since my son was born, 1 year and a half ago, to now. I love these bottles in particular because it can be use with or without the vent system. The vent system is also great because I can change it as my son grows. It helped reduce feeding problems, and made it easier for my son to use bottle since it is similar to breastfeeding, thanks to the paces flow. And an awesome feature to it is that it fits my breast pump! It makes it 100 times easier for me while I pump. To top it off it's BPA-free. It's been the most wonderful bottle i have and will ever use for my little one!
I was recommended these bottles by a family member however, she used the original bottles, not the "options". While I do find that there has been overall improvement of the spits up, burping and colic, the construction of the bottles seems to have gaps. When the vents are in, there is a fair amount of leaking. This is problematic when traveling with the bottles. We've worked around this by waiting until we're just about to feed the baby before putting in the vent - we dont even have them in when heating up the bottle and testing it. It almost seems like the water collects at the top of the vent and then because the screw on top part is not very thick, the milk leaks out. However, without the vents, I do not have this issue. This website does offer some possible solutions to this in their FAQ section which we will try however, their solutions do not address why the bottles would leak (unheated) while traveling. I lost around 200ml traveling once. I do like the option of using the bottle with or without the vents. I tolerate the leaking because of the improvement I saw with the gas / spit ups. But perhaps the original bottles are better as my family member did not have this same issue.
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