can anybody tell me how to check baby's heart beat plzzz

if there was any particular need for you to check it, your doctor would have let you know how and what to check for.

what is your reason for checking. are you afraid it is dead?

You check the brachial artery, on the upper inner arm.

Just put your hand over the heart and you will feel it contracting if you are just checking the heart rate. Keep you hand there for 1 minute while you are counting and you have their heart rate.