How to unlock these co-op babies?

[Dinos_Ge]

I'm having trouble on unlocking these babies, since I already unlock everything in the game, but still don't know how to deal with these babies.
They are:
Hive Baby
Cracked Baby
Dripping Baby
Blinding Baby
Any idea? Or is there have any website that I can find to solve this?

[LuckSack]

There's a wiki that hass all the unlock info, but the hive, cracked, and dripping babies are unlocked by beating everything on hard mode with ???, eden, and lazarus respectively. Blinding baby is unlocked by using the blank card spacebar item with a sun card.

[EvilShuckle]

Yup, just wiki it and you'll find soon enough. To unlock all babies you 'just' need to get everything on hard with everyone. Blinding baby is the exception, like lucksack said. So, just... keep playing. I myself only need to do all on hard with keeper. Wish me luck

[Dinos_Ge]

Thank you guys! I really appreciate it and hope you guys get lucky over there