A baby's heart rate of 125 beats per minute at 12 weeks is generally considered normal and healthy. During early pregnancy, the fetal heart rate tends to be higher and gradually decreases as the pregnancy progresses. The normal range for a baby's heart rate between 12-14 weeks is typically between 120-160 beats per minute. However, it's important to note that individual variations can occur, and slight deviations from the average range may still be considered normal. It's always best to consult with your healthcare provider who can assess your specific situation and provide personalized guidance based on your medical history and any additional factors. If you have any concerns about your baby's heart rate or overall health, don't hesitate to reach out to your doctor for further evaluation and reassurance.