Louise Brown, what about the first baby born by IVF?

On July 25, 1978, in Oldham, England, Louise Joy Brown was born. She weighed 5 pounds 12 ounces and was the first person in the world conceived through in vitro fertilization. Newspapers called her a “test-tube baby” and her face reached front pages across half the planet.

Almost five decades later, her story remains the clearest way to explain where a technique that is now routine clinical practice actually came from.

Nine years trying to conceive

Louise Brown with her parents and her sister Natalie, both born through in vitro fertilization

Lesley and John Brown had spent nine years trying to have a baby. The diagnosis was tubal factor: Lesley had blocked fallopian tubes, and at the time that simply meant there would be no pregnancy.

In 1976 they came to the team of Robert Edwards, a physiologist, Patrick Steptoe, a gynecologist, and Jean Purdy, an embryologist. In November 1977 the procedure took place: an egg was retrieved, fertilized in the laboratory, and the embryo was transferred to the uterus. Nine months later Louise was born.

Jean Purdy’s contribution went unrecognized for decades, something recent historical work has set about correcting. In Mexico, July 25 is celebrated as Embryologist’s Day precisely because of her role in this case.

The Nobel came 32 years later

Robert Edwards received the Nobel Prize in Medicine in 2010. Steptoe had died in 1988 and Purdy in 1985, and the Nobel is not awarded posthumously.

The delay was not incidental. For years the scientific community and much of the public treated the work with suspicion, when not with open hostility. It took millions of births for the consensus to shift.

How many babies have been born through IVF

A study published in Fertility and Sterility, led by the University of New South Wales, produced the first global count using consistent methodology: between 10 and 13 million babies were born through assisted reproduction between 1978 and 2018, and adding the years since, the figure projected to 2024 sits between 13 and 17 million.

Put in terms of pace: a baby is born through assisted reproduction every 35 seconds worldwide.

Europe leads the count, followed by Asia and North America. In some countries IVF now accounts for more than 10% of all births.

What about Louise Brown today

Louise turned 48 in July 2026. She lives in Bristol, in the southwest of England, with her family. She is the mother of Cameron, born in 2006, and Aiden, born in 2013, both conceived naturally.

Her sister Natalie, four years younger, was also born through IVF and in 1999 became the first person conceived in vitro to give birth, news that at the time helped settle doubts about the fertility of people born through the technique.

Louise worked for years at a shipping company and now spends part of her time giving talks and interviews.

“I have not had to go through that process. But I would have done it, without a doubt, if I had needed it.”

Louise Brown, interview with El País, 2019

“It is sad that 41 years after I was born it is still a taboo subject. There are many people who do not want to tell those around them, who do not normalize it. It is a complex and hard stage, in which help is needed.”

Louise Brown for El País

That point still stands. Public figures speaking about it helps: we wrote about that in Billie Eilish and her support for IVF.

What changed since 1978

The procedure that made Louise possible was, compared with today, rudimentary: a natural cycle, no stimulation, one egg and one attempt per cycle. These are the changes that carry the most weight.

Controlled ovarian stimulation. It allows several eggs to be retrieved in one cycle instead of one, which multiplies the chances per attempt.

ICSI. Since 1992, microinjecting a single sperm cell into the egg opened the door to severe male factor cases that previously had no solution.

Vitrification. Ultra-rapid freezing of eggs and embryos changed the logic of treatment: today a single embryo can be transferred while the rest are preserved, rather than staking everything on one attempt.

Preimplantation Genetic Testing. It analyzes the embryo’s chromosomes before transfer, reducing the risk of certain abnormalities and of pregnancy loss.

Multicycle Programs. They account for more than one attempt from the moment the plan is designed, which is how IVF works in practice.

ROPA Method. It allows one woman in a female couple to provide the egg while the other carries the pregnancy, so both take part in it.

What Louise’s story still teaches

Her birth was met with alarmist headlines and warnings about what science was doing. Almost five decades later, she leads an ordinary life and millions of families exist because of that technique.

It is worth naming what did not change too: no fertility treatment can guarantee a pregnancy. The odds have improved enormously since 1978, but they still depend on age, diagnosis, and how each body responds.

Frequently asked questions

Who developed in vitro fertilization?

Robert Edwards, Patrick Steptoe, and Jean Purdy, in England. Edwards received the Nobel Prize in Medicine in 2010; his two colleagues had already died and the prize is not awarded posthumously.

Do people born through IVF have health problems?

Long-term follow-up shows no differences attributable to the technique. Louise Brown leads a healthy life and had two children naturally, as did her sister Natalie.

Does the procedure hurt?

Egg retrieval is done under sedation, so you do not feel it. Afterward there may be cramp-like discomfort for a day or two. Embryo transfer is virtually painless.

Why was she called a “test-tube baby”?

It is a journalistic nickname, not a medical term. Fertilization happens in a culture dish, not a test tube. “In vitro” means “in glass,” as opposed to “in vivo,” inside the body.

If you are on that path

Louise’s story began with a couple who had been trying for nine years and had been told there was nothing to be done.

If you have been trying to conceive for some time, a First Consultation gives you a clear diagnosis and the real options for your case.