Conversation so far:
What is Zap Comix?
Zap Comix is an underground comix series which was originally part of the youth counterculture of the late 1960s.
How was the response to Robert Crumb's work for Zap Comix?
Crumb had difficulty at first finding retailers who would stock it, and at first his wife took to selling the first run herself out of a baby carriage.
What more is known about Robert Crumb and the underground comix?
How did Robert Crumb's sexually explicit work do?
What were Robert Crumbs best known works?
In the 1960s and 1970s, he produced his best-known works, including his Keep on Truckin' strip, Fritz the Cat, Mr. Natural, and oversexed African-American stereotype Angelfood McSpade.
Did Robert Crumb win any awards for his work?
Crumb has received several accolades for his work, including a nomination for the Harvey Special Award for Humor in 1990 and the Angoulême Grand Prix in 1999.
What is the interesting aspect of Robert Crumb and the underground comix?
The work was popular, and Crumb was flooded with requests, including to illustrate a full issue of Philadelphia's Yarrowstalks.
Did Robert Crumb comply with the requests to illustrate characters?
Robert Crumb illustrated an issue of Yarrowstalks.
What is the outcome of 1967-1979 for Robert Crumb?

Question: Did he have any children during this period?
Self-contained rewrite: Did Robert Crumb have any children during this period?