Since Ellie was born, I've written a few cute things Claire has done related to the baby.
There was a whole thing with Ellie's umbilical cord stump. Claire was fascinated by it. We talked about what it was and how it would fall off. And how she had one when she was a baby and hers fell off. One day she told us her umbilical fell off and she needed to go to the store to get a new one!
She was sure that Ellie was eating from mama's tummy.
Early on, she was confused that we were calling the baby by a real name. She would tell us "Not Elizabeth, baby sister!" Then as we began calling her Ellie regularly, she would correct me if I tried to say Elizabeth. "No, not Elizabeth. Ellie!"
She loved to comment on Ellie's "tiny toes!" She also loved to see Ellie's "lello (yellow) poops."
Claire would look at Ellie and say in a cute, high voice "Oh, she's so cute!"
When Ellie was a few months old, we pulled out the play mat. A pink square with bars arc-ing over it, with toys attached. Claire was sure that this was a toy for her. It soon became a tent for her. She would have us help her put a blanket over the top and play in her tent.
Claire has also enjoyed trying to teach Ellie new skills. When Ellie was working on rolling, Claire would get on the floor to teach her how to roll. Once Ellie could roll, and was getting attention for doing so, Claire would roll all over the floor and say "Look at me! I'm rolling!"