9 May 2019 Red blood cell production by the bone marrow is lower than normal in these babies. As red blood cells live only a few days, their destruction is not accompanied by adequate production by the bone marrow to maintain normal values . The following may also contribute to the onset of this anaemia: Rapid growth of the newborn, with increased blood volume The need to take blood for testing when the baby is sick. There are also other situations that can lead to anaemia, including: Loss of blood during delivery Diseases that are accompanied by higher destruction of red blood cells. This article was written with the support of physicians and other clinical professionals from the Hospital da Luz network. The content published in the Health Guide is intended for the general public and is provided for informational and educational purposes only. It does not replace individual medical assessment, diagnosis, or personalized clinical advice from a qualified healthcare professional. The content is produced or reviewed by physicians and other healthcare professionals at Hospital da Luz and is based on the knowledge available at the time of publication or the most recent update, as indicated at the beginning of each item.