There can be several reasons why a baby may not be growing properly during pregnancy. It is important to consult with your healthcare provider for a thorough evaluation and appropriate guidance. Some possible causes include genetic abnormalities, maternal health issues such as high blood pressure or diabetes, placental problems, inadequate nutrition, smoking or substance abuse, infections, or certain medications. Your doctor will conduct further tests and examinations to determine the underlying cause and develop an appropriate treatment plan if necessary. It's crucial to follow your doctor's advice and attend regular prenatal check-ups to monitor your baby's growth and ensure their well-being throughout the pregnancy.