When should i get concerned??

My babe was born April 10th so he'll be 3 months on Tuesday. He can smile, laugh, recognize people and certain phrases like "I love you", he can follow people and objects with his eyes, roll over, stand and jump with very little support, he can hold his head up, sit up from laying down, and now he's practicing holding himself up in a sitting position. But he still can't look towards sounds yet. I try to get him to do it, but he just absolutely won't for some reason. I know he can hear because he passed his hearing test at birth and he startles to loud/sudden noises. I know that every baby hits their milestones at different times, but I feel like he should be looking towards sounds by now. HOW do i get him to do it and should it be a worry at this point? I'm a ftm so please no judgements as I've never done any of this before Thanks in advance!