Congenital onset HP:0003660 Congenital onset literally means present at birth. Congenital abnormalities are thus generally acquired during fetal development. Congenital abnormalities are often but not always hereditary in nature. Whether a disease manifestation is diagnosed to be intrauterine or congenital may depend on the time at which diagnostic procedures are performed. Thus, most congenital abnormalities are also intrauterine. This term should be used for phenotypic abnormalities or diseases initially observed at the time of birth. For abnormalities observed prior to (e.g., by fetal ultrasound), use the term Antenatal onset (HP:0030674). HP:0003595 A phenotypic abnormality that is present at birth. HP:0003666 UMLS:C2752013 HP:0003601 Symptoms present at birth HP:0003624 UMLS:C1836142 Onset at birth Onset