My needs for bottle caps are firstly to keep the bottle top clean and hygienic, secondly to prevent a mess when shaking a bottle to mix formula, and I thought it might seem useful to have the measuring marks on the cap, so I tried it. I put my baby's bottles in a bag for daycare, and this first need is not met when simply dropping a bottle into the bag (the lid comes off). The second need is met as long as I keep a finger on top. I have personally not found it useful to have the measuring markings, because they are so hard to see that I'd rather use another bottle with printed markings. If you are using these on bottles that aren't being transported around in bags, or really need the measuring markings, then these might be for you. They are significantly thinner than the avent caps.
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