A child needs more than 3 parents such that there is balanced gender representation.
Now it’s more like a corporation.
Imagine saying “A corporation needs one man and one woman as the board of directors”? that’d be too small.
Ideally, each child should have at least 7 parents but as a board of directors is usually 12 members, then there should be 6 men and 6 women as co-parents in total per child.