Your baby is hungry.
These are NORMAL key "hunger cues" that a baby does, anytime they are hungry.
Feed on demand... ALWAYS, no matter how frequently a baby is hungry. They NEED the sustenance.
I recommend the book: "What To Expect The First Year" which you can find at any bookstore or online even at www.amazon.com
It is a MUST for a new Mom.
Also keep in mind, that at growth-spurt periods, a baby can even "cluster feed" meaning they even will need to feed even every hour....
never go longer than 3 hours without a feeding, and do NOT feed according to a "schedule" or a baby will NOT get enough intake.... always feed on demand, 24/7, day or night.
At growth-spurts, a baby will be hungrier and will want to feed.
Make sure your baby is latching onto the breast properly, and you have adequate milk production... if not, a baby will ALWAYS be hungry and not be satisfied after a feeding. You can ask your Pediatrician or a Lactation Consultant.
A baby's mouth, should be encircling the ENTIRE aereola/nipple, not just the tip of the nipple, to feed properly.
Drinks LOTS of water, during nursing and all day... this aides milk production, and eat healthily.
All the best,
Susan