Congratulations on the new baby! 
A babymoon might help with this little one. I did it with my younger two and it really helps with getting the milk supply going. Basically, the mum settles comfortably in bed with all she needs around her including a drink, magazines, radio, phone, if she wishes. Dad can look after the house and produce meals and other creature comforts.
Then have the baby very close by and feed her every time she so much as squeaks, even if it’s only 15 minutes since the last feed. In between times, get as much sleep in as possible. After doing this for 48 hours, I found the amount of milk I was producing had increased noticeably and the baby was much more settled.
You can do it any time, not just with a newborn, if you think their appetite has suddenly increased,