Leaks during feeding time are also a HUGE hassle. Our bottles were rated by noting where is it leaking from? Do the extra parts make it susceptible to leaks? Is it hard to get the lid screwed on just right? With a fussy baby in hand, we wanted to know how easy it was to get a leak-free assembly in a hurry and some scored better than others in this area. We also wanted to know which might leak too much during feeding causing frustration for baby.
We also employed a side-by-side "Pinch Test" to rate the "feel" of the nipple, with ranges from hard, firm, medium, soft and even very soft in comparison. Nipples were ranked lower if they became deformed, inverted or collapsed during use, or if they caused any frustration for the baby that impeded proper feeding.
Ease of Cleaning
Are Plastics Safe for Baby Bottles and Sippy Cups?. Scores were impacted by the number of parts and whether or not the parts required specialized tools to clean them well.
We decided to look a little closer, delving into what risks plastics may pose, and what research is available to answer that question. Please read our article Are Plastics Safe for Baby Bottles and Sippy Cups? for a complete overview of our findings. In the end, we gave higher scores to products that used glass or silicone, which are believed to be safer materials.