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Hormones for IVF. Photo: Leon Neal/Getty

American women are having only half as many babies as they did 50 years ago, but fertility technology is becoming a bigger and bigger business.

The big picture: The number of babies born per U.S. woman has dropped from 3.58 to 1.89 in the last half century. But women still want help getting pregnant — and answers about their health outside the doctor's office.

So dozens of companies are crowding a market projected to reach $30 billion in annual sales in five years, introducing tracking apps, wearable tech and at-home fertility tests.

  • Andreesen Horowitz recently invested in Glow, a company that raised $23 million. Glow makes apps that track menstruation, fertility and pregnancy.
  • Union Square Ventures put money in Clue, which makes a competing app and raised $29 million.
  • Sequoia led funding for Maven, a virtual women's health clinic.

Other innovators in fertility tech include Meet You, a Chinese fertility tracker app that doubles as a social network; Ava, a wearable device that tracks fertility through physiological metrics like body temperature and breathing rate; and Quanovate, a device that gives real-time feedback on a woman's fertility based on urine samples.

  • "There's potential for this area to really grow," says Ja Lee, an analyst at CB Insights. "You have half the population that wants this, but there are not consumer-friendly solutions that are easy to understand."

Between the lines: Many younger women are using these new apps not to pursue pregnancies, but to avoid them, Lee says. "Even if they may not want to have kids ... it gives women info about their general health."

Go deeper: The next generation of fertility treatments

Go deeper

DOJ pressed to enforce Al Jazeera foreign agent ruling

Illustration: Aïda Amer/Axios

The Justice Department is being pressed to enforce its own demand that the U.S. arm of Qatari broadcaster Al Jazeera register as a foreign agent.

Why it matters: The launch of Al Jazeera's new right-of-center U.S. media venture, Rightly, has refocused attention on the media company's alleged links to Doha, and DOJ's efforts to crack down on media outlets viewed as foreign interest mouthpieces.

Poll: Immigration is America's most-polarizing issue

Data: The American Aspirations Index/Populace; Chart: Will Chase/Axios

Immigration was found to be the most polarizing issue in America based on new polling from Populace.

Why it matters: Americans have surprisingly similar priorities for the U.S., but immigration stands out as one of the few issues with clear partisan differences. It underscores the challenge for advocates and lawmakers hoping to pass immigration reform in the coming weeks amid narrow margins in Congress.

Lawmakers hide behind AG's investigation as Cuomo lingers

A billboard outside Albany, N.Y. Photo: Matthew Cavanaugh/Getty Images

New York Gov. Andrew Cuomo is politically wounded but not yet dead, several state lawmakers tell Axios.

The state of play: Most are holding their fire and punting to state Attorney General Letitia James' investigation into sexual harassment allegations. They expect the inquiry to be credible and thorough — and buy Cuomo badly needed breathing room.