Genetic errors.
Interference with development in utero. (Alcohol, hypoxia, disease).
The hearts of the babies are not properly developed.
Genetic errors. Interference with development in utero. (Alcohol, hypoxia, disease).
You can never live with no heart because you blood will not pump around your body if your heart doesn't work, that's why when some babies born with no heart they only live just a couple of minutes or none.
some babies are born more developed then others and develop at different stages
Yes, heart defects can kill. A heart defect is a structural abnormality in the heart. It makes the heart inefficient. The heart has to work harder to sustain life. The heart wears out or enlarges from being overworked. It might not be enough to oxygenate the body to sustain life. Most babies are born with an Patent Ductus Arteriosus (PDA). This is an extra pathway in the heart for the fetus. Around 10 days, this PDA closes. Without this extra pathway, some defective hearts are unable to sustain life. Surgery or medicines are required to save the life. Alternately, some heart defects are benign. A Still's Murmer is a heart murmer that can only be detected when the patient is horizontal. It has no known ill effects.
No, not all babies have blue eyes when they are born. Some babies are born with very dark eyes.
Some do...
No, human babies can even hear some sounds in the womb.
Yes, but some have to be born by c-section.
There are some types of heart problems, perhaps some of them do not allow a man or woman to generate a baby, and some can be controlled by medications thus allowing people to have babies. This is a matter that only a cardiologist can decide who can and who can't. Obviously this is referred to serious heart conditions. Many heart problems can be treated thus allowing people to live a normal sexual life.
Yes. Some babies are even born with teeth.
It would affect it because the body cells would not be getting oxygen.