Welcome
We have developed this website to serve as a registry for the world's smallest surviving babies. Because the survival of infants with birth weights less than 400 grams (14.1 ounces) is very uncommon, it is not possible for meaningful data on the outcomes of these infants to be collected in a single neonatal intensive care unit (NICU) or even a network of NICUs. We hope over time to collect and collate data on the long-term health, growth, and development of this vulnerable group of infants. The infants listed in this registry include those reported in the lay media as well as medical journals. We have not attempted to verify the information listed, since in most cases this would not be possible. We invite health care providers and parents to send us corrections or updates of data already included in the registry or to submit new cases for addition to the list. We hope that the information provided here will be of some help to physicians and parents faced with difficult decisions about obstetrical and pediatric care in situations where such a tiny baby may be born. It is well known, however, that gestational age is a much more important factor than birth weight in determining the prognosis of an extremely premature baby.

View list
In order of date of birth
In order of birth weight

Males only, in order of date of birth
Males only, in order of birth weight
Females only, in order of date of birth
Females only, in order of birth weight

Submit information
Submit new listing
To submit corrections or additional information on a baby already listed, click on "Add/Edit information" in the last column of the infant table.

Your comments and suggestions are appreciated so mail us at the following address:
webmaster@mail.medicine.uiowa.edu