What is the reason of no heartbeat a baby in 4 months pregnant mother?

There are several possible reasons why a baby may not have a heartbeat at 4 months of pregnancy:

* Miscarriage: This is the most common reason for a missed heartbeat at 4 months. A miscarriage is the spontaneous loss of a pregnancy before 20 weeks. Miscarriages can be caused by a variety of factors, including chromosomal abnormalities, hormonal imbalances, and uterine abnormalities.

* Ectopic pregnancy: This is a pregnancy that occurs outside of the uterus. Ectopic pregnancies can be dangerous and can even be fatal if they rupture.

* Fetal demise: This is when a baby dies in the womb. Fetal demise can be caused by a variety of factors, including genetic disorders, infections, and placental problems.

* Gestational trophoblastic disease: This is a rare condition that occurs when the cells that form the placenta grow abnormally. Gestational trophoblastic disease can cause a missed heartbeat and other pregnancy complications.

It is important to see a doctor immediately if you are pregnant and you have a missed heartbeat. Your doctor will be able to determine the cause of the missed heartbeat and recommend the best course of treatment.