Despite them saying "boy" on the color options, they're for all babies 0+ months old. I think due to the size of the bottle they're probably better for a few months and up but the tips included are slow flow. All of them are the same; you just get 3 of them so it's convenient for washing or babies drinking multiple liquids. They have a curve to them making them easier to hold than bottles that are flat on the sides. The plastic is BPA free which is a must to me for plastics. The measurements are clearly marked and each comes with a top cap. Each time they're used it's really important to check the vent by cleaning and squeezing. They make it really clear all over to do so. It's important to be sure the vent is working properly since it's such a big bottle that holds a lot. These are awesome for transitioning as baby grows. the tips are interchangeable with their other style tips that are sold separately. I can keep using the bases/caps, and just change out the tips as needed.
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