I've read that formula-fed babies are more at risk for obesity. Is that true?

That depends on whom you ask. "Theres a possible link between breast milk protecting against obesity," But other experts disagree with that theory. To minimize the risk of overweight or obesity, make sure you don't overfeed with formula. It might be tempting to make sure your infant finishes a bottle but if you're baby doesn't want to drink it all, give her less. Also, be careful not to mix in too much powder or add too little water to concentrated liquid formula.

I've heard that certain types of plastic bottles are dangerous--what's the real story?

"In general, it appears that the risk of harm from leaching is very small,"but any parent who is concerned can try to choose those that do not contain polycarbonate/bisphenol A (Avoid #7 on the bottom of the bottle)." Alternative bottle materials include glass, non-polycarbonate or opaque plastic (which is soft), and disposable plastic with replaceable plastic liners.

Is it bad to heat it up in a microwave?

Yes. It may seem to save time but you could accidentally burn your baby's mouth. "The problem is that even though what you feel when you put a little out on your wrist is OK to you, microwaves heat unevenly. There may be a little spot that is scorching and you don't know it. Instead, fill a large coffee mug with a little water, heat that in the microwave, then set the bottle into the coffee mug so the water sorrounds it. "That will heat the bottle up quickly and evenly."

My baby spits up a lot after feeding - what's going on?

All babies spit up somewhat because they don't have the sphincter muscle control to keep milk or formula down in their small tummies. Spitting up excessively might also mean that a baby has been fed too much or has gas. Spit up tends to subside gradually as babies develop and learn to sit up on their own.