Conversation so far:
when can a baby be born and survive
In general, infants that are born very early are not considered to be “viable” until after 24 weeks gestation.
what is the survival rate for babies born before 24 weeks
If you give birth to an infant before they are 24 weeks old, their chance of surviving is usually less than 50 percent.
are there other issues with being born early
Some infants are born before 24 weeks gestation and do survive. But these infants have a very high chance of severe long-term health problems.

Question: when is the usual timing
Self-contained rewrite: when is the usual timing for giving birth