Twins and multiples have been around forever, but people are often still mystified as to how they happen. And with assisted reproduction, the incidence of twins and triplets or higher multiples has increased. How do multiples happen?

Getting pregnant after surgical sterilization

Can you get pregnant with a blocked tube or two? Yes, you can, but your odds are lower. What should you do?

Sometimes the next baby is not so easy to produce as the previous one. Why does that happen?

Travel is often a concern for women who are trying to get pregnant or newly pregnant. Don't let that stress you out.

If I had to name the top 3 things to improve your odds for conception, I would pick these three.

The thyroid is key to many body functions, including the menstrual cycle. If your thyroid is not working right, conceiving and carrying a pregnancy can be difficult.

The thyroid is so important for your entire body function, but especially for conception. Even if you are told you have normal thyroid function, you should take care of your thyroid.

I grew up in a Catholic town. For birth control, most families loosely practiced the rhythm method, and as a result, most families were large. Recognizing that the method has limitations, natural family planning has become more popular, and it can be a lot more effective.

A review of the book "The fastest way to get pregnant naturally" by Christopher Williams, MD