It's so easy to worry when other mum's tell you what their lo's doing at the same age and yours isn't. Morgana was 8 weeks early so is naturally a little behind in her development. She is 8 months now, she can sit unaided for 2 seconds, then she falls over, but she sits well supported. She has been able to stand straight when held for a number of weeks now (standing is her favourite thing at the moment). She rolls over, but doesnt roll back, she snake shuffles when on her tummy and supports herself well for a while. She doesn't babble yet, it's mostly squealing noises, but she has her first two teeth. As you can see, development is a real mixture, don't get frustrated, it's not a race