(Note: Approaching it as a story.)
Telekinesis (It's a power, powered by the mind, so the baby should have more control than others and may even start with a weaker as in generate not enough power to be a real danger, since it was expressed mentally and doesn't have that much physical stimulus compared to other powers. Reminds me of Mob Psycho 100. Kid was born with overpowered psychic abilities, and he turned out just fine, like he didn't accidentally kill his parents. He did scare his older brother to death in one episode though. I cannot imagine telekinetic babies being the most problematic of the bunch, because it's a mental power.)
Fire (Babies with fire powers are basically high-functioning arsonists.)
Super Strength (Baby might grow to be a gentle person or a timid soul if scolded/traumatized enough in their youth. Like the gentle giant trope, except this one started as a baby. I imagine there are a lot of bone-breaking, and if the adults around were aware and supervised the baby, no one should die. Even if bones were broken, the doc could still fix them, I think? As a developing infant, the said baby might even develop a tendency of wanting to move lots and be adventurous.)
Electricity (Could become arsonists too, but the parents should be able to safe-proof the kid easier than the others. It might be the safest power a kid could get, even safer than a telekinetic baby. Since its electricity, probably adds a lot of neurons to the kid? I don't know, but I always found electorkinetics should be smarter than its common kinetic counterparts just because they have more neurons.
Necromancy (Highly likely to develop psychopathy after said baby discovers the joy of ripping up cats, and small animals, or digging up entrails,. Harming small animals is a recurring background story for psychopaths. or empty people. It doesn't help that necromancy comes with a natural stigma as old as the medieval times.)
In the end, I found pyrokinetic babies as the most dangerous of the lot. They don't even need to move that much to cause enough danger to kill lots of people. They just need to get excited, and not understanding their powers enough, they'd set a whole family on fire, plus the house, plus the neighbor, plus the next forest. Even if the firemen arrive on time, there would be lots of casualty and collateral. And yes, I voted, fire babies.