Growth-spurt.
She is approaching, the 6 month mark, and this is a growth-spurt time... and major developmental changes time.
This happens.
They get hungrier and need to feed.
Each baby, is different in sleep and temperament.
Don't compare to the other baby.
Both my kids as babies, fed a LOT.... and they "cluster fed" which means a baby will even need to feed/get hungry every single hour.
They need to be fed. They are growing. My kids had HUGE appetites... and woke like yours.
Its normal.
For the 1st year of life, breast or Formula is a baby's PRIMARY source of nutrition... not solids and not other liquids. This is per our Pediatrician as well... and they need to be fed on-demand. And so intake keeps pace with their growth/development.
Or, when she wakes... see if she is just tossing and turning... or really waking... and crying. If she is just tossing and turning.. let her be. She may simply be sort of 'awake' but still go back to sleep on her own. KNOW her sounds. Sometimes, a baby does not have to be picked up at every sound/movement they make while sleeping... unless they REALLY wake and then cry. Then feed her.
Wakings... are either because they need to and are hungry... or they are just tossing and turning... and at this type of 'waking' they, if not interrupted... may just go back to sleep.
But your baby DOES seem hungry thus waking. She IS intaking 4 ounces each time. So yes, at that point you need to feed her. As you said, she IS hungry EACH time she wakes.
Both my kids were like that too. But I breastfed.
Or, have your Husband wake and feed her at night. So you can rest.
"Over-stimulated" babies, do not sleep well. Nor over-tired babies. Know her cues. A baby, will typically get tired, after about 2 hours of 'awake' time... then need a nap. Babies, typically nap 3 times a day. Is she napping?
**Adding this: what you could ALSO do is... instead of giving her a 4 ounce bottle... try putting more in it. Say 6 ounces. She may very well, drink that, all of it. Thus, this will indicate to you, that she needs more... and is hungry.
all the best,
Susan