A recent development in fertility treatment has seen babies being born with DNA from three people. This technique, known as mitochondrial replacement therapy (MRT), is considered a breakthrough in the field, having the potential to prevent certain genetic diseases. However, the procedure has raised a number of ethical and safety concerns. The process involves replacing faulty mitochondria from the mother with healthy ones from a donor, which results in the baby carrying DNA from three individuals. It’s a controversial procedure that is currently only legal in the UK, but it has opened new possibilities for those struggling with fertility issues, particularly those related to genetic diseases. While this technique seems promising, it is still in the early stages of research and questions about long-term effects and safety remain unanswered.