Using the pregnancy calendar to follow your baby and body's growth in pregnancy week by week is fun. Some of the other ways you can use it, other than simply reading it online, is to use it to show your children how your baby is growing. The ultrasound pictures always captivate my kids and they have some one-on-one time to ask questions about the new baby. It was their favorite day of the week and quickly became a fun ritual as we awaited a new sibling.