How fast should your baby's heart rate be at seventeen weeks?

If you mean when you are 17 weeks pregnant, the heart rate is typically somewhere between 110-160 (although at that point, it may still be a little on the high side--the heart rate tends to be the fastest at the beginning of the pregnancy). If you mean how fast your baby's heart rate should be when he or she is 17 weeks old (after being born), it typically will be in the 90-160 range and will slow down over the next several years until it reaches the adult average of 60-100 by the teenage years. Hope this helps! Dr. B