Most people have their own routines for their everyday life: when they wake up, eat breakfast, go to work or run some errands, lunch time, dinner time, and their nighttime routine. When a baby comes, the routine may disappear or become a total mess, but some people just adjust it and avoid chaos.
However, there is a great possibility for conflict to spark when one person has a routine for when they cook dinner and another insists on changing it. One Reddit user found herself in a similar situation after offering her grandson a snack before dinner, but ended up being scolded for not cooking a meal earlier.
More info: Reddit