I'm a first time mom too, so here are just some tidbits I've picked up in the almost year and a half since my son was born. You had said in another post that she was also born a month early, right? Usually with premies they track development based off of their expected due date, not their actual birth date. If you go off of that, she's really the equivalent of a four month old, so it's not suprising that she's not sitting yet! If the clingyness is bugging you, or keeping you from getting housework done, I highly recommend a sling or wrap. You just pop them in, they're happy from being close to you, and you have both hands free to do dishes, vacuum, whatever! It's actually good for their muscle development, because with all the movement from you walking, bending, lifting, etc, they have to constantly adjust their muscles to stay comfortable. It's also good for premies and "sick" babies. Just look up Kangaroo care. And trust me, they'll grow out of the clingyness. My now 17 month old was very clingy up until about three months ago, and he's just come out of his shell. He'll go to almost anyone, waves and smiles at complete strangers, and doesn't mind being without me for long periods of time. It's not something you have to force, just know they'll get there in their own time. And I would say no outright to the cereal. The AAP is considering changing their stance on when solids are introduced from a firm 6 months to when a child is developmentally ready for them, i.e. reaching for food, sitting unsupported, and will put any toys you give them in their mouth. But if weight or growth is a concern, talk to your doctor. Good luck, and try to keep a positive outlook!