I would really appreciate some advice. My dd is 6 months next week and has only recently started reaching out for objects. She's not rolling completely over yet or sitting up unaided. All the other babies of her age in our group seem to be doing these things. I know I shouldn't compare but I just need reassurance she is okay. She was 3.5 weeks premature so should I be expecting her to be developmentally more like a 5 month old than 6? I'm a bit worried about starting her on solids if she's not developmentally ready - should I hold off a bit? I sound really negative and I don't mean to be, she is happy, healthy, always smiling and has even started laughing! I would just like to know that everything is normal. Thanks in advance.