Polypropylene

Like strollers, cribs, and nearly everything else baby–related, I was stumped when I had to buy bottles for my baby. Unaware of which brand or style to purchase, I went on the advice of fellow mothers and bought a supply of Dr. Brown's.

My friends said that the patented internal-vent system incorporated in the Dr. Brown's Natural Flow bottle helped their babies avoid gas, indigestion, and, in some cases, colic. I was sold. My only problem was that the bottles were only available in plastic, which is a serious downer for mothers like myself trying to avoid it.

But alas, Dr. Brown's has boarded the glass-bottle train. In December, the manufacturer began selling its genius bottle in glass form ($13 for two 3.5-ounce bottles). And late next month, the brand will be introducing its newest line of polypropylene baby bottles.

Which do you prefer: plastic, polypropylene, or glass bottles?

Exercising outdoors in the winter is all about layering and choosing performance base layers can be tricky. Basically there's two main choices. Polypropylene or Merino Wool.

Polypropylene is a quick drying polyester fiber that wicks moisture away from the body. The fabric was engineered to do the wicking, since we all know regular polyester just makes you sweat. The downfall? The fabric retains odor, so even though you wash it, it can still smell a little stinky. Patagonia makes 4 different weights of its polyester performance baselayer called Capilene, so you can dress according to the temperature. They cost anywhere from $40 to $90.

On the other hand, Merino Wool is a natural fiber that's not at all itchy like that bumpy sweater your grandma knit you. When it comes to an active lifestyle, it keeps you warm in the winter and cool in the summer. The wool naturally wicks away moisture. Plus, it can be washed and won't shrink. The downfall? It's a little more expensive than "polypro." Smartwool makes a great long sleeved shirt for $75.

If you want to know which one you should choose, read more