S.H.
Growth spurt.
ALWAYS feed on-demand.
Infants, also do what is called "Cluster feeding" which means they even feed every.single.hour.
Because, they are growing so fast and developing.....thus the importance for feeding on-demand.... 24/7, day and night.
An infant, has growth-spurts every 3 weeks. So 9 weeks is coming up.
THEN, a baby will have growth-spurts at 3 months old, 6 months old, 9 months old, every 3 months.
During growth-spurts, their intake needs increases as well as the frequency of feedings. It is biologically, what is needed... so that intake keeps UP with them and their growing.
all the best,
Susan