Nighttime Sleeping

My 9 week old daughter goes to sleep at about 8p and was sleeping until 1230a - 130a before waking up to be fed (formula baby) then would go another 4 hours.
Now, she isn't making it past 3 hours at a time before she's crying to be fed, making for a very long night for mommy!
I've tried to feed her a little more ( 5 oz instead of 4 oz ) before bed but she gets full after 4.
Any thoughts???
Good night all! Signing off at 3am :(

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    04/08/15
    Bethany Reilly
    I'd say a growth spurt.
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      04/08/15
      Bethany Reilly
      Baby sleep changes a lot. You can't count on a solid, good schedule of night time sleep until they turn about two years old. Even then, babies can regress.
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        04/08/15
        Bethany Reilly
        Here's an article about growth spurts:
        http://www.netmums.com/baby/growth-spurts
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          04/08/15
          Bethany Reilly
          It helps to have other mommas that can go through it with you! My son is 18 months and still wakes at night a few times during the week! It's quite frustrating but I just go with it
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