Mine was 167 at 12 weeks 163 at 16 weeks and at 20 weeks it had slowed down to about 136!! The doctor explained to me that as the baby gets bigger the heartbeat will slow down. He compared it to a tiny hummingbird who has a really fast hearbeat because it is so small but larger birds have slower hearbeats. Maybe a little silly but anyway he said everything was fine and that it is normal for it to slow down.
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