Babies responding to their name?

So we’re getting towards the end of this 4th leap. Only 4 days left 🥳. One of the skills learned is ‘baby responds to their name?’ Kind of baffled by this? Anyone’s baby responding to their name? I feel like my son knows his name, sort of, because we say Jesse a lot and he thinks it’s funny. He definitely doesn’t respond to it though. I feel like 4 1/2 months is really early for this skill?