If you have formed a regular feeding habit, then you should feed on time, but for newborns, feeding on demand is still very important.
The baby's feeding time should be flexible. Sometimes the baby's appetite is better, sometimes worse, and it may be affected by the growth cycle, so there will be different situations such as being hungry in advance or eating less at a certain meal. Parents should learn to judge whether the baby is really hungry from the characteristics of the baby's crying, movements, etc., and if they are hungry, they should feed the baby in time, and don't be too dogmatic.