Prepare important occasions together.
Choose the counting convention before planning a milestone.
Choose tasks, assign responsibilities and print your own list.
Choose whether birth is day one, verify the 99-day or 100-day offset, and keep the calculated milestone separate from a family gathering date.
Compare the three milestone rules, understand missing month-end dates, and record a family celebration separately from the calculated date.
Agree the activities first, give each task a clear owner and completion condition, then save a printable copy of the plan your families actually chose.
