Should I be worried?

Je

My son will be 15 weeks on Tuesday and he still doesn’t grab for things. He does hit things that are hanging from his activity mat, but I think it’s just a coincidence as he’s flailing his arms. He’s obsessed with sucking on his hands and fingers, so I will shake toys at him but he isn’t motivated to grab them at all. He will track his toys with his eyes, so I do think that he’s interested, but he’s just content to look/watch.