in 4 week scan my baby heartbeat was 169bpm then every week it dropped and in 16week scan it's showing 150bpm. is it normal that heartbeats are getting slower and slower day by day??

A. See the heartbeat should be somewhere between 120 to 180 then it is considered normal so right now it is much above 120 which is good so I don’t see any problem with that if you have a doubt you get an ultrasound done from time to time