They told me the same thing with my first and he's perfectly fine. they thought he might have a heart murmur but he's 4 and never had any problems
It may be PACs. Premature Atrial Contractions. Relatively a benign finding that typically resolve. If the OB truly thinks an arrhythmia is present that is an indication for a referral to a perinatologist.
Did you ask what an irregular heart beat is? I'm not sure. Hopefully someone can help