Congenital
The word perinatal means relating to a period slightly before and after birth. This is usually considered to be a couple of weeks.
The term "young" may refer to a state of mind or a state of being. By definition, it means "only appearing or existing for a short while". It may also refer to a living organism soon after birth, but not before birth.
"pre-" means before, so pre-existing means to exist before (something), or to procede. For example, there were already pre-existing symptoms when the doctor diagnosed the disease. Or, fast food stores that pre-existed McDonalds.
Previously means "existing or occurring before in time or order" and fits the best interpretation of the question I can manage.
prental
Prenatal would be a good antonym for antenatal.Antenatal means 'after birth', prenatal means 'before birth.'
The letter "C" before a birth date stands for "Circa" which means "about." It means that the date is not certain, but is approximate.
Anti natal means before birth
The affix "pre-" means before or existing beforehand. It is commonly used in English to indicate something that comes before or ahead of something else.
Natal means birth and the prefix pre means before, so prenatal means before birth. If someone is prenatally diagnosed with something, their mother was still pregnant with the child during the diagnosis.
The prefix pre means means before.