Questions from experts and media after He's talk challenged him on various grounds, such as, what are the unmet medical needs that lead one to resort to gene-editing, when there are other proven alternatives to prevent HIV/AIDS?

They also asked what was the process to prepare the consent form for the parents and to get their consent, and whether He’s team was competently trained to take consent in such experiments. He said that the parents are well educated and given two rounds of informed consent, which they understood.

He also was asked about what he thinks is his responsibility to Lulu and Nana as they grow up.

He did not answer the question with specifics, but in his speech he said that the informed consent document provided information about regular blood tests and other medical procedures.

Yang Zekun and Wang Feng in Hong Kong contributed to the story.