Site Map

Neutropenia - infants

Neutropenia is an abnormally low number of white blood cells. These cells are called neutrophils. They help the body fight infection. This article discusses neutropenia in newborns. Neutropenia can occur at any age.

Images

Neutrophil

I Would Like to Learn About:

Causes

White blood cells (WBCs) are produced in the bone marrow. They are released into the bloodstream and travel wherever they are needed. Low levels of neutrophils occur when the bone marrow cannot replace them as fast as needed.

In babies, the most common cause is infection. A very severe infection may cause neutrophils to be used up quickly. It may also prevent the bone marrow from producing more neutrophils.

Sometimes, an infant who is not sick will have a low neutrophil count for no obvious reason. Some disorders in the pregnant mother, such as preeclampsia, can also lead to neutropenia in infants.

In rare cases, mothers may have antibodies against their baby's neutrophils. These antibodies cross the placenta before birth and cause the baby's cells to break down (alloimmune neutropenia). In other rare cases, a problem with the baby's bone marrow may lead to decreased WBC production.

Exams and Tests

A small sample of the baby's blood will be sent to the laboratory for a complete blood count (CBC) and blood differential. A CBC reveals the number and type of cells in the blood. The differential helps determine the number of different types of WBCs in a blood sample.

Treatment

The source of any infection should be found and treated.

In many cases, neutropenia goes away on its own as the bone marrow recovers and begins to produce enough WBCs.

In rare cases when the neutrophil count is low enough to be life threatening, the following treatments may be recommended:

Outlook (Prognosis)

The baby's outlook depends on the cause of the neutropenia. Some infections and other conditions in newborns can be life threatening. However, most infections do not cause long-term side effects after the neutropenia goes away or is treated.

Alloimmune neutropenia will also get better once the mother's antibodies are out of the baby's bloodstream.

Related Information

Granulocyte

References

Benjamin JT, Torres BA, Maheshwari A. Neonatal leukocyte physiology and disorders. In: Gleason CA, Sawyer T, eds. Avery's Diseases of the Newborn. 11th ed. Philadelphia, PA: Elsevier; 2024:chap 71.

Koenig JM, Bliss JM, Sperandio M. Normal and abnormal neutrophil physiology in the newborn. In: Polin RA, Abman SH, Rowitch DH, Benitz WE, Fox WW, eds. Fetal and Neonatal Physiology. 6th ed. Philadelphia, PA: Elsevier; 2022:chap 119.

Letterio J, Ahuja S. Hematologic problems. In: Fanaroff AA, Fanaroff JM, eds. Klaus and Fanaroff's Care of the High-Risk Neonate. 7th ed. St Louis, MO: Elsevier; 2020:chap 16.

BACK TO TOP

Review Date: 11/6/2023  

Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Professor of Pediatrics, University of Washington School of Medicine, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

ADAM Quality Logo
Health Content Provider
06/01/2025

A.D.A.M., Inc. is accredited by URAC, for Health Content Provider (www.urac.org). URAC's accreditation program is an independent audit to verify that A.D.A.M. follows rigorous standards of quality and accountability. A.D.A.M. is among the first to achieve this important distinction for online health information and services. Learn more about A.D.A.M.'s editorial policy, editorial process and privacy policy. A.D.A.M. is also a founding member of Hi-Ethics. This site complied with the HONcode standard for trustworthy health information from 1995 to 2022, after which HON (Health On the Net, a not-for-profit organization that promoted transparent and reliable health information online) was discontinued.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- 2024 A.D.A.M., a business unit of Ebix, Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

A.D.A.M. content is best viewed in IE9 or above, Firefox and Google Chrome browser.