Can human biological instincts be suppressed?
Yes, for example, death by holding one's breath. Humans cannot autonomously hold their breath to the point of death, but they can use a plastic bag to cover their heads, controlling themselves not to tear it before fainting, thus causing death through sheer determination!
But...
Humans cannot defy biological science!
It takes at least eight or nine months for an embryo to develop into a baby, and normally ten months is the standard!
But what about Zhang Li?
In 1987, June 1st, there were no signs of pregnancy yet.
No... not to say she wasn't pregnant.
Even if she was already three months pregnant, it would just not be obvious.
It still wouldn't be possible for her to give birth to Duan Feipeng on July 12, just one month later!
This defies biological science; it's completely impossible, wrong, and false!
Unless...
"There's a problem with the age!?"
