Newborns have tiny tummies and so need to feed frequently. Feeding frequently in the early days and weeks helps make sure you have a good milk supply.
Because breastmilk is easily digested, it is normal for breastfed babies to feed 8–12 times in a 24-hour period. This usually means that your baby will breastfeed on average every 2–3 hours around the clock (day and night), with possibly one longer stretch between feeds somewhere in a 24-hour period. The length of time between feeds can vary greatly from baby to baby. The time between feeds is from the beginning of the last feed, not the end. Newborns also tend to have periods each day where they feed very frequently for a few hours (cluster feeds). So often baby’s cluster feed late afternoon into the evening, this is very normal and healthy. They are preparing your milk supply for the night time. Often these cluster feeding periods are followed by a longer stretch of sleep.
In most cases, healthy, thriving newborns will wake of their own accord for feeds and so get all the milk they need. Feeding your baby when he/she is showing early feeding cues can help him to feed better.
However, there are some reasons why a newborn may be extra sleepy. It may be necessary to wake your baby for feeds to ensure he/she gets the milk they need. Some of the reasons are medical (eg jaundice or perhaps medications/pain relief used during labour/birth) others may be related to their weight or general health. It is important to be guided by your doctor or midwife in these situations. They will communicate openly with you about why your baby’s needs are different, how to meet their needs and when to ask for help.