"To follow a routine" means to have a set schedule or pattern of doing things regularly. It involves doing certain tasks or activities in a specific order and at specific times.
Sentences with «to follow a routine»
Doing it slowly might involve substituting a cup for, say, the lunchtime bottle and following that routine for a few days. (babycenter.com)
Moreover, while some babies have a specific schedule of breastfeeding and sleeping, others don't follow any routine. (shrewdmommy.com)