MADISON, Wis. -- The face of pregnancy in the United States is changing. It's becoming older.

Birth rates among women 35-49 are soaring. But doctors say older women face some unique challenges.

"One of the biggest regrets my patients have that are older -- they didn't understand there wasn't a magic pill or shot that I had for them," said University of Wisconsin reproductive specialist Dr. Elizabeth Pritts. "Most are regretful they didn't start earlier. Most didn't understand there really is a biological clock ticking for us, unfortunately."

Women may be born with more than 1 million eggs in their ovaries, but only 300,000 are left by puberty. Only about 300 will be ovulated during a woman's entire reproductive years.

That means as more women wait until after age 35 to begin their families, their chances of getting pregnant sharply decline.

Age-related infertility is becoming more common.

But Pritts wants the public to know there may be options.

In-vitro fertilization remains the most common form of assisted reproductive technology today. The technology translates into miracles such as baby Trinity.

"You get to a point where you need to do something else," said Diane Kopan. "We had gone through other procedures. We said, 'It's time,' and then were fortunate enough that it worked on the first shot."

Kopan was 39 years old when she gave birth to Trinity.

"We grow many eggs," said Pritts. "We harvest them at the correct time, toss them in a petri dish, toss sperm in, then take the fertilized embryos a couple of days later and put them back into her uterus. It's cool, it's really cool, it's like a miracle."

The Kopans' first picture of Trinity is of a fertilized egg in a petri dish.

Now the Kopans are sharing their story so other families won't feel alone.

"She's definitely a miracle," said Kopans. "She had to have a name to fit it. That just worked."

The 9-month-old is named Trinity Elizabeth, after Elizabeth Pritts.

At 39 and 48 years old, mom and dad couldn't be happier. They say they wouldn't have done it any other way.

"Had I had children earlier, I don't know if I would've been as appreciative as I am now," said Trinity's father, Greg Kopan. "Every moment is very special and entertaining."

"It's unbelievable," said Kopan. "I don't think you realize all you've gone through until afterwards."

"She's just a joy to be with."

While in-vitro worked for the Kopans, it can be cost-prohibitive for others.

They said the entire procedure cost about $13,000 and isn't covered by insurance.

Massachusetts is the first state where insurance does cover in-vitro fertilization. It's also the first state where women 30 and older now outnumber younger moms.

A new pregnancy magazine is about to hit the market.

The magazine is called "Plum" and focuses on pregnancy in women 35 years and older.