Rotten Pulp: Sick filth

Absolutely nothing. Stop worrying.
At night it crawls to the highest point it can find and lies there, crooning softly. It won't stop or sleep until it can get there. If you try to stop it, it'll just keep butting it's head against any barriers until you remove them. On the d4th night, a black shape swoops down and takes it.
Its teeth are sharp. It leaves a ring of blood when it breastfeeds. It won't eat or drink anything but meat and blood.
It gets sick of hanging around the womb and eats its way out of you.
You can't cut the umbilical cord. The baby slowly drains your strength through it. Over a matter of days, you weaken as it becomes bigger, until you swap places and it nurtures you as its stunted child.
The baby is perfectly healthy, but its skin is always cold. It never makes a sound, just watches you constantly. If you leave it alone in a room, you come back to find the room has changed in strange, impossible ways.
You give birth to a knot of blind snakes and mud, twisted in the shape of a child. Some black magic has swapped them for your true baby.
Born with no eyes, just a smooth skull. It sings haunting melodies in the night. Some nights, you hear a refrain singing back from somewhere far away.
Sickly and weak, with thin, papery skin. There's a hive of wasps inside its brain. Sometimes they come out, through it's nose and ears, to gather small trinkets and return with them.
During the birth, three ragged elves arrive with long knives, planning to kill it. They don't speak your language.
During the birth, three richly-dressed elves arrive with gifts: A strange drug, a knife, and a knot of silk in a noose. They don't speak your language.
It bonds to you and grows, fungus-like.
Your significant other made some bad deals. An old man with two iron stakes stuck in his eyes arrives for the child. If you refuse to let him, he'll remove the stakes, ripping off his old man skin to become a raging wildfire that will swiftly consume everything around it. If your baby is set alight, it will instantly burn to become a perfect sculpture of ash, and the fire will abate.
It does nothing but scream constantly as the most wretched fluids of the earth pour from its every orifice, just like every baby.
The baby never stops bleeding, but has no wounds. You slowly grow weak from blood loss.
Twins. One is disemboweled, with her organs wrapped around her sibling. Before they can be disentangled, the organs constrict and draw the still-mewling twin inside the open torso of the dead baby. As her chest seals over the living baby, her eyes open. She is bloated, but alive.
You are unable to feel anything but blinding, irrational hatred for it. If left alone with it for a long period, you'll need to save to avoid doing something terrible.
Over the course of a night you give birth to 2d20 babies and a few gallons of tar.
It can't stop shaking. The shakes intensify until it's as if it's being thrown around the room by an invisible force.
Baby? You've never had a baby. What are you talking about?

Leech: A small black tube with teeth that latches on and sucks out your blood, secreting toxins to stop you feeling it.
Tick: An insectile Dracula that hides on your body. It's tiny head burrows deep within you, excreting poisons that numb and paralyze, while it feeds the bloated body above.
Tapeworm: A long worm that lives in your intestines and eats most of your food.
Guinea Worm: Thin white Dracula that enters your body when you eat tainted meat, growing up to several feet inside you. When it's ready to breed, it pokes it's head out through a blister and sets your leg on fire. When you dunk the limb in water, it releases it's young in a big white cloud.
Horsehair Worm: This one grows up your spinal chord until mating season arrives, when it reprograms your brain and forces you to throw yourself into the nearest lake. As you drown, it crawls out of you to mate with other Horsehair worms doing the same thing.
Dracula Bat: A species of bats that sucks blood from your toes as you sleep. Any adventurers that sleep in their caves will wake woozy and weak.
Emerald jewel Dracula: A wasp-woman Dracula, known for her Breeding Stings. The first sting paralyzes you. The second sting pours venom into your brain, leaving you a zombie. The Dracula then leads you back to her lair and pours you full of her young, eating your legs for sustenance before flying out. Over the next few weeks her young will eat their way out of you as you watch.
Mosquito Woman: Emaciated women with transparent wings and a long, lethal proboscis. They swoop down, spear you with their proboscis, and then drink their fill. When they've finished they waddle away, bloated and happy, leaving you a drained-out husk.
Changling: A baby Dracula that's placed in the womb of an expecting mother while she sleeps. Born as the "Twin" of the real child, and slowly usurps it.
Childblight: Sexually-transmitted Dracula. Seems to cause miscarriages - in reality, your children will be born into the Draculasphere.
Glass Book: A book that steals your knowledge as you read it. Clever sorcerers know how to force them to give knowledge up, in the same way that snake charmers harvest venom.
Strangler Fig: A seed that plants itself over your body, then slowly grows over your limbs. At first they'll grow bloated and powerful, making you run or punch better. Eventually, it will paralyze your mind and leave you to watch helplessly as it controls your body.
Ghoul: One who eats corpses to gain their power. Will typically trail after the party, fleeing if seen, eating the corpses of all they kill.
Nega-Man: Looks like an inverted photograph of a human. When it touches you, it steals a part of your soul - a thief skill, a spell, or your attack bonus.
Dracula Husband: A sack of wet meat. Chooses a lover and secretes poison into them. Once the lover's been poisoned, they forget all their old goals and live only to serve the Husband.
Dracula Wife: A Succubus. Sleeps with humans so that it can feed from their dreams.
Body Snatcher: It takes over your body by feeding you a special poison and then chanting, leaving your soul in it's last body. It will typically poison it's old body moments before transferring to a new one. Any body it inhabits will begin to rapidly grow hair within about a week.
Tongue-eating louse: Replaces your tongue and talks for you, whispering blasphemies as you sleep.*
Mutton Chop: A parasitic beard.
Husk: Hollow humans that must stuff their empty bodies with stolen organs. Usually find places as rich nobles, where they can fund the constant organ replacements they need.
Card Shark: Grifter Dracula that feeds off bargains made with with hard-done-by gamblers.
Two-Faced Dracula: Appears before wizards and promises them incredible knowledge - in return, they just need to let it grow off the back of their head as a second face. It knows nothing. It'll keep stalling for time for as long as possible.
Dracula Monkey: Invisible creature that clings to your back, feeding off your happiness and dragging your down into depression and madness.
Bloat: A tiny creature that infects the mind of a host, making them crave the contact of others. Every creature the host touches will melt and bind onto them, eventually forming a massive ball of dripping humanity.
Skeleton Pox: Dracula virus that eats your skin and organs from the extremities inwards. Eventually there's nothing left but your skeleton, which is then free to dance the night away.
Devil-Boob: The underside looks like a limpet mouth. Replaces a breast and feeds your offspring Devil Milk, twisting your babies until they become it's Dracula Children.
Leg Horse: Those foolish enough to sleep in the Lair of the Leg Horse will see him in their dreams, a creature made of dozens of galloping legs shrieking "Join me or Die!". All who accept wake to find their legs gone - another pair added to the Leg Horse.
Shadow: Murders your reflection and replaces them, using you to see through to the human world. It grows more confident the more it sees. Slowly it will stop the pretense of copying your actions and start breaking through into reality.
King of the Draculas: The moon.
Queen of the Draculas:

*Because C. exigua is found in snappers from the Eastern Pacific and is shipped worldwide for commercial consumption, contamination of the parasite is inevitable.

You've been eating fish-tongue parasites your entire life.

What's wrong with your baby?

Night of the Draculas!