Picture book from 1980’s (?) about a preschool aged child’s relationship with a baby sibling. Illustrations depict a messy, hippy-ish house, perhaps in Vermont, with a frumpy, gentle mom. Specific pictures include: the outdoors with a steep path leading down to the home with baby in stroller and sibling walking; hall entryway with pegs on the wall where coats are hanging and shoes & boots scattered on the floor; frazzled mom cooking with baby on her hip crying and sibling playing on the floor; sibling helping button clothes on baby and maybe attempting to tie own shoe; sibling feeling tender toward baby in their shared bedroom and maybe text anticipating baby being old enough to play. Illustrations have lots of detail about the environment, which is a warm but messy home, e.g. baby socks on the floor, toys scattered, kitchen counters cluttered, etc. Aesthetic of home is alternative, earthy.
Sounds a bit like a Shirley Hughes illustrated book – perhaps one about Alfie and his baby sister Rose?