At Fertility Madrid, our fertility clinic prides itself on being at the forefront of assisted reproduction. Recently, the prestigious New York Times published an extensive article dedicated to our work and the evolution of embryonic research. Today, we reinterpret that narrative in English, combining scientific rigor, ethical sensitivity, and the innovation that defines us, to offer you an analysis that connects science, law, and the potential of life.
A Decisive Moment in Fertility History
On June 24, 2022, a day marked by significant judicial decisions in the United States (with the ruling in Dobbs v. Jackson Women’s Health Organization), one of our patients received the news that seven of their fertilized eggs had reached the blastocyst stage at five days.
The excitement was palpable as the embryo deemed most likely to develop into a baby was transferred under conditions of utmost precision. This moment not only symbolizes a personal milestone but also reflects the profound debates worldwide about the “potential of life.”
The Significance of the Embryo: Small in Size, Giant in Impact
From a medical standpoint, an embryo is the result of fertilization and is defined up to the eighth week of development. Although its size is minute—comparable to a raspberry—its impact on a person’s health and development is immense.
At Fertility Madrid, we understand firsthand the emotions and challenges inherent in the in vitro fertilization (IVF) process: from the uncertainty of the first signs of pregnancy to making decisions regarding frozen embryos, topics that are now a crucial part of the global ethical and legal debate.

Embryo development from day 1 to day 5: image showing embryonic evolution up to the blastocyst stage during an in vitro fertilization (IVF) treatment.
Ethical Debates and Legal Challenges
The discussion about when “potential life” begins has intensified in the context of recent legislative changes. In some U.S. states, controversies have arisen regarding the legal personhood of embryos, with cases that have even led to contentious judicial decisions concerning frozen embryos.
Although these debates often focus on abortion, they also reveal the complexity of treating embryos—fundamental tools in IVF—as subjects of rights and ethical considerations. At our clinic, every treatment is performed following rigorous protocols that blend the latest technology with a deep ethical commitment.
The Revolution in Assisted Reproduction
Since the birth of Louise Brown in 1978, the first baby born via IVF, science has advanced exponentially. Today, hundreds of thousands of embryos are preserved in cryogenic tanks and are studied in laboratories worldwide.
These advances have allowed improvements in both freezing protocols and success rates in fertility treatments. At Fertility Madrid, we adopt these innovations to offer our patients the best opportunities to achieve their dream of parenthood, always within an ethical and responsible framework.

Birth of Louise Brown, the world’s first baby conceived through in vitro fertilization. Keystone/Getty Images
The 14-Day Rule: An Ethical and Scientific Limit
For decades, the scientific community has adhered to the guideline of not cultivating embryos in the laboratory beyond 14 days. This limit, based on the development of the “primitive streak”—an indicator of the formation of essential structures for individual development—has served to balance scientific progress with fundamental ethical considerations.
However, recent experiments have managed to keep embryos in culture beyond what was once thought possible, opening the door to discoveries that could help prevent pregnancy anomalies and birth defects. This evolving field invites a rigorous public dialogue about the future of embryonic research.
The development of embryonic models from stem cells has revolutionized the way we study the earliest days of life. These models, which replicate key aspects of development without using fertilized embryos, offer an alternative to better understand organ formation and the causes of failed pregnancies.
At Fertility Madrid, we collaborate with experts in this field, exploring techniques that optimize our treatments and contribute to enhancing the quality and safety of assisted reproduction.
Reflection and Commitment to the Future
The path of embryonic research is as fascinating as it is complex. The intersection of science, ethics, and law challenges us to constantly rethink our practices and engage in open dialogue about the value of life and the potential of reproduction.
At Fertility Madrid, we are committed to innovation and excellence, ensuring that every advancement is made with the utmost respect for ethics and the dignity of our patients.
To learn more and explore the original New York Times article, we invite you to read the full post on the NYT. This analysis aims not only to inform but also to spark a constructive debate about the future of fertility and embryonic research.