This is a very helpful link, from Dr. Sears:
http://askdrsears.com/html/7/T070300.asp
Your baby is normal. She is waking, because at this age, they have a normal biological "growth-spurt." And at each growth-spurt they NEED to feed...because their need for more intake increases, in proportion to their growing.
Per our Pediatrician, for the 1st year of life a baby needs to be fed on-demand... and breastmilk/formula is their PRIMARY source of nutrition... NOT solids, NOT other liquids.
Both my kids woke up like that too. And my son had a GINORMOUS appetite!
Your baby naps VERY well. Be glad about that. Most Moms would LOVE to have their baby to nap 2.5 hours.
-what time does she nap? At this age they usually nap in the mid-morning.
-sometimes, when a baby is "over-tired"... they actually do NOT sleep well at night AND they wake more.
- does she have regular consistent bedtimes? The more consistent, the better.
For a baby, "sleeping through the night" means sleeping for at least 6 hours straight. MANY babies at this age do not. Sleeping through the night differs for each baby. Some kids do not sleep through the night until 2 years old or older. AND, teething and separation anxiety and then "night terrors" occurs, which are all normal developmental "changes" in sleep patterns.
If you can have someone else feed the baby at night.. .that is a part solution. Then you can rest.
A baby, wakes for biological and survival needs: hunger, discomfort, pain, illness, developmental changes. They can't help it... they don't do it on purpose.
I know, it can be SO tiring. I went through that with 2 kids... but they won't be a baby for long, and at some point you will think that THIS is easy... and then when their other difficulties and phases occurs... this will seem like nothing.
It's all a blur right now I"m sure. But MOST IMPORTANT... is NOT to expect a baby or child to 'behave' older than they are. Otherwise, it will only lead to frustration.
As long as your baby is getting proper intake, and growing well and gaining weight.. then you can be assured she is fine. Or, maybe she is teething...
What you can also try is: adding another ounce to the bottle than you normally do. She may surprise you and drink all of it too... thus indicating, that she needs more intake and more ounces.
All the best to you,
Susan