Aspirin is a common nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain, reduce inflammation, and lower fever. However, its use during pregnancy is a topic of concern due to potential complications. According to the information provided, aspirin can cause several complications in pregnant women.

Firstly, aspirin use during pregnancy increases the risk of fetal bleeding, which can lead to complications during delivery [1]. Additionally, aspirin use in the third trimester of pregnancy can result in prolonged labor, bleeding after delivery, and low birth weight [1].

Furthermore, aspirin use during pregnancy has been linked to an increased risk of premature closure of the ductus arteriosus, a blood vessel in the heart of the fetus [1]. This condition, known as persistent pulmonary hypertension of the newborn (PPHN), can cause breathing difficulties and other complications in newborns [1].

Moreover, a study published in the American Journal of Epidemiology found that aspirin use during pregnancy was associated with an increased risk of miscarriage [2]. However, the study noted that the risk was low and that further research is needed to confirm the association.

In summary, aspirin use during pregnancy can cause several complications, including fetal bleeding, prolonged labor, low birth weight, premature closure of the ductus arteriosus, and an increased risk of miscarriage. It is essential to consult a healthcare provider before taking any medication during pregnancy.

Sources:

1. DrugPatentWatch.com. (2022). Aspirin. Retrieved from <https://www.drugpatentwatch.com/drugs/aspirin>
2. Werler, M. M., Mitchell, A. A., & Shapiro, S. (1992). Use of nonsteroidal anti-inflammatory drugs in early pregnancy and risk of miscarriage. American Journal of Epidemiology, 136(11), 1463-1472. <https://doi.org/10.1093/oxfordjournals.aje.a116463>