Sperm + egg + a place to grow.
Silverberg was inspired by a close friend who is not biologically related to his children.
The author told BuzzFeed Life that "when the 6-year-old son of one of my very good friends (a dad who is trans) started asking questions about his mom's pregnancy, the parents simply wanted a book that would help them explain where babies come from that would work for their family. But it didn't exist."
Seven Stories Press
That's when Silverberg teamed up with illustrator Fiona Smyth to create What Makes A Baby. The book quickly spread among other families who didn't have a book that fit their story.
Says Silverberg -- "Single parents, adopted families, LGB families, people using surrogates, the list goes on... The response from families who had never seen themselves in a book about reproduction was overwhelming and powerful."
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This Children's Book Explains All The Different Ways Babies Are Made