Baby already behind 2 month milestones

Has anyone had a baby be behind based on their adjusted age so early? My baby is 2 months adjusted and already not meeting all of the CDC milestones - he’s very weak at tummy time, isn’t excited to see us, and doesn’t track us from afar. He also doesn’t calm down when we pick him up or speak to him most of the time. He does social smile and coo. Has anyone had a similar experience? If so - was your baby alright?