How many bpm should the heart beat be?

Last week my babys heartbeat was 165 bpm and this morning it was only 135 im just a little worried that something may be wrong is it normal for the babys heartbeat to flucuate?

[Skylynns_mom]

Babies heartbeats do flucuate.  Its possible the baby was resting when you took its heartbeat in the morning.  They say anything 120+ is great, so i think you'll be just fine

[pinkbelle]

I havent had a scan in 6 weeks so Im very nervouse I go today at 9:30 and I am incredibly nervous but since I heard the heartbeat theres no chance of miscarrying right?

[LosingMyMindInGA]

Even though you've heard the heartbeat there is still a CHANCE that you can miscarry though it has decreased a lot.  As for the heartbeat...babys will start with a higher heart rate and continue to decrease until they level out anywhere from 120's to 150's.  I had an u/s on 1/3 it was 182 and on 1/26 it was 171.  Are you listening to the heartbeat at the doctor or with one of those home heartbeat things?  That could make a difference.