Well, not to be rude or mean but didn't you know that babies get hungry during the night and they don't sleep all night, really really sleep all night until they're much older and sometimes 2 years old?
I often see this sort of thread and am confused. Babies don't sleep through the night. Their tummies are about the size of their fist. They can't hold much in it and they're going to be hungry, starving hungry every few hours. They do NOT really sleep more than 2-3 hours at a time until they're a lot bigger and their tummy has at least doubled in size. Nothing will change this. They get hungry when they get hungry. They need to eat at least every 3 hours. To fill up totally again. Then 2-3 hours later they'll do it again.
I truly think women who go around bragging their babies slept through the night at this age are fantasizing or hallucinating from sleep deprivation...truly, I do. They make it sound like that's normal.
I have over 13 years in child care, I have babysat kids since I was a teen. I know of 1 baby that laid down at 7 in the evening and slept past 7 in the morning. Only 1 and the mom was so engorged she felt like she was about to rupture when the baby finally woke up.
Babies are not supposed to go to sleep and not wake up in a bit to eat. Really, I think that a mom who says her baby sleeps all night is fudging. She probably means the baby goes down at some ridiculous early time then wakes up right about when the mom is going to bed. Then gets a full tummy. Sleeps a few more hours then wakes up in the middle of the night, which that mom could say is in the morning, then goes back down to sleep some more. So even though they say the baby goes down and sleeps all night they really aren't laying down, going to sleep, sleeping 12 hours without waking, then waking up happy and alert and ready to eat.
Babies wake up all night long. Nothing will change that except growth.
If you are exhausted and need a break then have mom or mother in law or cousin or bff come over and take care of the baby all night while you sleep. You can pump enough over a few days to have 2-3 bottles made up where they can feed the baby. So you can sleep.