^onesies and those spit up rags are also very helpful with a newborn. They go through multiples a day. Diapers are a very personal choice, unless I know what they like I rarely get diapers as a gift. Maybe some things that will make day to day easier like something to clean bottles or warm milk up? Idk what kinda budget you have but maybe something they can put the baby in like a rocker, or surveillance stuff. You can also use Pinterest for fun ideas.