MAM bottles use a vented base design that lets air into the bottle without mixing it into the milk. This is the core difference between MAM and most other baby bottles, where air typically enters through the nipple and creates bubbles in the liquid. The result is a smoother flow with less gas for your baby, plus a nipple shape specifically engineered to feel familiar to breastfed babies.
The Vented Base: How It Reduces Colic
Most baby bottles vent air through a straw or valve near the nipple. MAM takes a different approach by placing the valve at the bottom of the bottle. As your baby drinks and creates suction, air needs to enter the bottle to replace the liquid leaving it. The base valve lets that air in from below, preventing it from passing through the milk on its way in.
This matters because when air travels through liquid, it creates foam and tiny bubbles. Your baby then swallows those bubbles along with the milk, which can lead to gas, discomfort, and the fussiness often labeled as colic. By routing air through the base instead, the valve keeps the milk smooth and bubble-free throughout the feeding. It also maintains a steady, even flow so your baby doesn’t have to work harder as the bottle empties.
The base itself unscrews, which is part of how the bottle comes apart for cleaning. This is also what makes the self-sterilizing feature possible (more on that below).
The Nipple Design
MAM nipples have a flat, slightly asymmetric shape rather than the round dome you see on many bottles. This shape was developed using real-time MRI imaging of how a baby’s mouth moves during breastfeeding. During nursing, the breast naturally flattens against the roof of the baby’s mouth. MAM’s nipple mimics that same compression, which is why the company reports a 94% acceptance rate among babies.
The silicone surface has a soft, slightly textured finish that MAM calls “SkinSoft.” It’s designed to feel more like skin than smooth silicone, making the transition less jarring for a baby who’s used to the breast. The base of the nipple also has an anti-slip texture that helps it stay in place during feeding, so your baby doesn’t have to constantly re-latch.
MAM nipples come in different flow levels. Lower numbers have smaller holes for newborns who feed slowly, while higher numbers allow faster flow for older babies. If your baby is gulping, fussing, or collapsing the nipple during feeding, it’s usually a sign you need to move up or down a flow level.
How the Self-Sterilizing Feature Works
One of MAM’s most practical features is that the bottle doubles as its own sterilizer. You disassemble the bottle into its three parts (body, nipple assembly, and base), place them inside the bottle body, add 20 milliliters of water (about one fluid ounce), and microwave the whole thing for three minutes. This works in microwaves between 500 and 1,000 watts, which covers most home microwaves.
The small amount of water creates steam inside the sealed bottle, which is what actually kills bacteria. You don’t need a separate steam sterilizer bag or a countertop unit. This is especially convenient for travel or for parents who sterilize bottles frequently throughout the day.
Materials and Safety
MAM bottles are made from polypropylene, the same type of plastic used in most baby bottles on the market. Since 2012, the FDA has banned BPA from baby bottles entirely, so no bottle sold in the U.S. should contain it. Consumer Reports testing has confirmed that popular baby bottles, including plastic ones, show no detectable BPA, lead, or phthalates.
One thing worth knowing: some manufacturers have replaced BPA with chemically similar compounds like BPS or BPF, which have raised their own questions. MAM markets its bottles as free from both BPA and BPS. Polypropylene bottles in general can release microplastics when heated, which is an active area of concern across all plastic baby bottle brands, not just MAM. If this worries you, glass bottle options exist, though they’re heavier and breakable.
Assembly and Common Mistakes
MAM bottles have more parts than a standard bottle, which can be confusing at first. The bottle breaks down into the outer body, the base plate with its valve, the nipple, and a locking ring that holds the nipple in place. Everything screws together, but the base needs to be properly aligned and tightened or the bottle will leak.
The most common issue new users run into is leaking from the base. This almost always means the base isn’t seated correctly or the valve disc inside isn’t lying flat. When assembling, make sure the small silicone disc sits flush before screwing the base on. Some parents also find that overtightening causes leaks, because it warps the seal slightly. Finger-tight is enough.
Another frequent complaint is that the bottle drips from the nipple when held upside down. A small amount of dripping is normal, especially with faster-flow nipples. But if milk pours freely, check that you’re using the right flow level for your baby’s age and that the nipple isn’t damaged.
How Feeding Feels Different
Parents switching from other bottle brands to MAM often notice two things. First, babies tend to swallow less air, which means less burping mid-feed and fewer episodes of gassy discomfort afterward. Second, the flat nipple shape can take a feeding or two for babies to adjust to if they’re used to a round nipple, but breastfed babies frequently take to it quickly because the latch feels more natural to them.
The flow from a vented-base bottle also feels different to the baby. Because air enters from the bottom rather than bubbling through the milk, there are no sudden surges or pauses in flow caused by air pressure changes. This steadier pace can help babies who tend to gulp, choke, or pull away during feedings with other bottles.