Sadie's a typical 4 month old - she smiles, occassionally laughs, grabs things, and just tried some rice cereal last night for the first time. She's growing by leaps and bounds, and has become much happier than she was in the early days. She still has quite a temper, though, and we tread lightly, trying to keep her pacified.
Katie is doing well with her ongoing Big Sister role - she is very protective of Sadie, but loves to show her off to her friends. She's back in preschool five days a week now, and it's making a huge difference in behavior. I think she was going as nuts as I was with all the crying.