You can select and deselect days of the week when setting up your Reminders. All Reminders default to notify you every day. Enabled days will be highlighted in a blue circle, whereas days that are not enabled will not be highlighted.
If you enable the Daytime only setting, the reminder will only notify you during the hours that you have
set for when your little one is awake. Under your child's profile, check your day vs. night start times to see what these cut-off times are set to.