This bottle allows you to prepare the formula in advance. It reduces the risk of exposing the milk to unsanitary conditions when you open the formula can and water container just anywhere.
The Mixie has a built-in compartment at the bottom. It keeps the formula separate from the water until you pop the button on the bottle to mix them. This design minimizes the need to pack a formula container, water, and bottles separately. It also eliminates the need to use a cooler to pack pre-mixed formula.
The Mixie has more pieces than the standard baby bottle and it takes more time to clean. Although a dishwasher does a fine job of quickly cleaning it, those who choose to hand wash the bottle have to spend extra time and effort brushing the small parts to make sure no left-over milk is stuck in the nooks and crannies.
The Comotomo makes the switch as natural as possible since every part of the bottle resembles a mother's breast. It has a slow-flow nipple that mimics the natural flow of breastmilk. The broad, dome-shaped nipple allows the baby to make cheek, nose, and chin contact, promoting a nice sensation similar to when babies feed on their mothers. The silicone body is soft, giving babies the opportunity to squeeze the bottle just as they might squeeze a breast while nursing.
Most bottles are narrow and have parts that are hard to reach when cleaning. The Comotomo's three parts are wide, allowing you to clean them even without using a bottle brush.
Because of its unusual shape and material, it's likely to tip over when filling with water and formula. You'd have to hold the bottle down with one hand, making it a hassle especially for moms who are carrying their babies.
The rim of Medela bottles fit many types of pumps for collecting breastmilk. You can pump breastmilk into these bottles, use them for storage in the freezer and heat them in the warmer when it's time to feed your baby. This is more convenient than pouring milk from separate storage bottles to feeding bottles.
They are designed to withstand the extreme temperatures of freezers and bottle warmers. You can directly store your pumped breastmilk in these bottles and place them in the freezer for a long period of time. This eliminates the need of purchasing a different set of storage bottles.
When switching between breastfeeding and bottle feeding, you'll likely succeed with bottle nipples that are more like natural breasts. However, the Medela nipples are small, unlike a mother's nipples which are usually elongated. Also. the milk flow from a Medela nipple is fast and does not mimic the natural slow flow of a mother's milk.