Hello there!
Babies (and toddlers) love and thrive on routine. Though, it is up to you as the parent to help them learn when they are supposed to do certain things - like sleep and eat and play. As your baby gets older, you will have to help your little one modify the routine to suit the new development stage - for example, dropping from 3 naps a day to 2 and then from 2 to 1. Also, adjusting from 4 feedings a day to 3 "normal" mealtimes.
The important thing to keep in mind is that any change in routine takes between 3 and 5 days to "sink-in". But, they (and you) will get it. After learning from experience, half of the time the adjustment is bigger for the parents. As your baby gets into the toddler years, a routine is critical as there are so many other changes going on, the little one needs to know that some things always happen the same way. (My little guy just turned 2 and sleeps like a dream and never battles or fights when it is time to sleep.)
Look for the cues from your little one on when it is time to make the next move into a new routine - keeping in mind that the goal is to develop your child into a normal daily routine that makes sense and works for all of your family.
Take care!