Hey ladies! So my sweet little boy will be 6 months old this coming week. A friend  has commented saying "oh he isn't sitting up on his own yet?" And it worried me. He sits up fine in his high chair, in a bumbo seat and in his jumparoo. Should I be worried that he isn't sitting up on his own (like on the floor)? I feel like he will do it when he is ready but the way my friend said it actually kinda offended me.