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Health Indicator Report of Multiple Births

There is a high risk of adverse outcome for multiple births. The outcomes are addressed in the respective indicator profiles.

Multiple Births by County of Residence, New Jersey, 2013-2015

Data Source

Birth Certificate Database, Office of Vital Statistics and Registry, New Jersey Department of Health

Data Interpretation Issues

Each infant in a multiple birth is counted separately, so, for example, three triplets refers to three live born infants, not three sets of triplets and not necessarily three infants from the same triplet set. If, for example, a mother has a triplet pregnancy and one child is not live born, the two live born infants are each still considered to be one of a set of triplets, not twins.


Plurality is the number of all live births and pregnancy losses (miscarriages, ectopic pregnancies, fetal deaths, selective reductions) in a pregnancy. Multiple births are twins, triplets, quadruplets, and higher order births.


Number of live births which were part of a multiple pregnancy (twin, triplet, etc.)


Total number of live births

How Are We Doing?

There were 44% more multiple births in 2015 than in 1990 and the rate of multiple birth increased 78% in that same time period. Both the number and rate of multiple births generally increased through the 1990s and 2000s before beginning to decline after 2011. The vast majority (97%) of multiple births are twins. The number of triplets peaked in 1998 (at 467) and the proportion of multiples that are triplets is now less than one-third of what it was that year (3.1% and 10.1%, respectively).

How Do We Compare With the U.S.?

The multiple birth rate in New Jersey has been higher than that of the nation as a whole since 1991 and currently is 21% higher. This is thought to be due, in part, to assisted reproductive technology (ART) and the proximity of such services throughout the state, as well as the affluence of some parts of New Jersey compared to other parts of the country. Starting in 2001, state law required health insurers to provide coverage for medically necessary expenses incurred in diagnosis and treatment of infertility, including ART.[1]

Evidence-based Practices

The American College of Obstetricians and Gynecologists' (ACOG) Committee on Ethics published an Opinion report in 2013 advising physicians to be knowledgeable about multifetal pregnancy reduction. ACOG suggests prevention as the first approach and then fetal reduction if necessary and acceptable to the patient.[2]
Page Content Updated On 03/27/2017, Published on 09/28/2017
The information provided above is from the Department of Health's NJSHAD web site ( The information published on this website may be reproduced without permission. Please use the following citation: " Retrieved Fri, 23 March 2018 14:22:04 from Department of Health, New Jersey State Health Assessment Data Web site: ".

Content updated: Wed, 28 Feb 2018 05:01:06 EST