9 week baby goals...

What motor skills should my child have? Pediatrician says he’s behind with his neck strength 😓 we try to do tummy time but he just cries and cries. He’s pushing up off the ground sometimes,turns head. He can sometimes hold his head up when being held but he’s wobbly still.... he also smiles,eye contact, rolled over twice.

What else should he be doing???!! Tips for strengthening his neck?