Brain damage and underdevelopment can cause similar physical traits in affected individuals even if the conditions themselves are very different. This can be especially true if the damage occurs while the person is young and still growing. Even though Hudsyn didn't have any genetic abnormalities, the loss of brain tissue during early infancy caused her skull to not grow to the size it normally would have, so she has microcephaly like the Hartley sisters, although although her cranium isn't nearly as underdeveloped as theirs were. She also has high muscle tone like they did, giving her limbs a gnarled, twisted look similar to theirs. Ive seen other brain damaged kids who look like Hudsyn. Makayla, the little girl with Lissincephally(smooth brain), who was featured on her parents' Youtube channel "Our Lives, Our Reasons, Our Sanity, until she passed away last year, also bore a bit of a resemblance.
I'm intrigued by the fact that although this fetus was diagnosed with alobar holoprosencephaly, which is the most severe and deadly kind of holoprosencephaly(HPE) her facial features look like someone with the semi lobar type. Although both terms refer to brain and not facial development, the facial features usually develop inline with the brain. So that when a fetus has alobar holoprosencephaly they tend to look like cyclops babies. They usually lack noses and instead might have a stalk of hanging flesh protruding from their foreheads. Semi lobar HPE fetuses will usually have two eyes set very close together, a broad, flat nose and some kind of cleft lip and palette. which is what I'm seeing here. Mathew Nel has semi lobar HPE and this girl appears to look a lot like him. So I'm wondering if she actually does have alobar HPE is suffering from semi lobar HPE. Both are horrible conditions, the difference is that alobar fetuses usually always die before or shortly after birth, while semi lobar babies can also die in utero or not long after being born, in some cases, with extreme medical intervention, they can potentially survive for years. Notice I said "survive" and not 'live" because any kind of quality of life for these kids is usually nil, but they can be kept breathing, blinking, twitching etc. If this girl does have semi lobar HPE and she manages to survive birth, two things you know are going to happen. One, her mother is going to make sure the girl is kept alive as long as possible and will demand every expensive medical treatment she can get and two, she's going to spend the rest of that kid's sad, painful life exclaiming to the world about what a "MIRACLE!!!" her child turned out to be.