According to NOM, " We have no clue whether it was a planned motherless family or whether he and his partner stepped in to give a motherless child a family--since he will not say. But he and his partner are proud to announce they were both "very excited to become new parents."
And their Twitter post:
“Openly gay #CO Rep. @JaredPolis announces with pride that his child has no mother.”
Where they get this information we'll never know because they don't use facts, just assumptions.