Milestones

I know I shouldn’t compare babies but my son is almost 11 months and still doesn’t wave, clap, blow kisses and most importantly will not hold his bottle or sippy cup. Should I be worried about this? I try to work with him everyday on holding the cup but he just doesn’t understand the concept of tipping it and demands we hold it for him 🙄. It’s hard to see other babies his age doing all of these things. I know they all develop on their own but just want some peace of mind. Thanks mamas!