Room for improvement

Okay, so going from one child to two isn't all that easy. We were in a rhythm, a routine with Lauren. We could anticipate what she would need and when she would need it. We were able to schedule our lives, our outings, or guests based on her daily schedule. Well, we clearly haven't quite mastered that now that Brier has been thrown into the mix.
Today we attempted to run errands in the morning with both kids. I packed the bag with the necessities for Brier - diapers, bottles, formula, change of clothes etc, etc, etc, forgetting that it would all be happening in the middle of what is normally Lauren's snack time. Did I bring a snack for Lauren? Nope. Oh that's riiiight! I have TWO kids now!
Then, this afternoon we tried to go for a walk not realizing that it was nearly 4 p.m. and Brier hadn't eaten a substantial meal since 11 a.m. Needless to say she was not a happy camper.
I am trying to look at this as an area where we can improve. My husband thinks I am being too hard on us. My theory is, if we can figure this out and be more prepared these outings will be less difficult for everyone involved. If I were completing a performance review on myself, this would be a simple case of "room for improvement."