Birth weight
The health of the mother during pregnancy can affect birth weight. The fact that the mother is sick during the pregnancy, or that she has a chronic condition can affect birth weight. Usually, this will lead to a lower bith weight. For example, celiac disease confers an odds ratio of low birth weight of approximately 1.8. Certain drugs, such as those used to treat high blood pressure or epilepsy can also have this effect.  Other factors that affect birth weight are that if the mother is going to give birth to twins, which is called multiple births in English. Another factor that affects birth weight is the age of the mother: Girls 15 or younger, or women over 35 have a higher risk of having a child with a low birth weight.