Growth spurts !
Babies have immature sleep systems. They have very tiny tummies – only about the size of a cherry at birth! Babies grow rapidly, their liquid diet digests quickly. During those early months, your baby will have tremendous growth spurts that affect not only daytime feedings, but nighttime feeding needs as well.
This means that it is perfectly natural, absolutely normal, and totally expected for your baby to wake up in the night and need nourishment or your help to fall back to sleep. Sleeping all through the night, every night, without needing a parent’s assistance, is like learning to walk or talk or drink from a cup — all kids get there, but they do so at their own speed, a little bit at a time, and in their own unique way.

Actually, it\’s common nature to the child. There is no regular routine for them. If you breastfeed your baby, you can have a baby lounger to breastfeed your baby safe at night.
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Sleep and feeding patterns change with growth spurts, all perfectly normal

It could be cluster feeding or they are just being fussy.. Try bottled boiled water between normal feed times. I have to do for my 4wk old baby.. It’s about making them stick to their routine..

she maybe going through a growth spurt so maybe up her milk in the day

Every baby is so different. Have you considered co sleeping? It saved my sleep

unfortunately babies dont read the same milestone books as we do, they tend to do things in their own time. It could be a growth spurt or just a phase, dont look to far into it bub will settle into a rhythm

i hope things are better now

Sometimes it is just a growth spurt causing disruption

Hope she is sleeping better for you now.

She might just be growing and not wanting to sleep cause she is sore

when she is a bit older she will sleep longer, that’s what I found

how is she sleeping for you now?

At this age they are still establishing a routine, it could also be a case of being hungry.

I hope you found some sort of answer to why she is waking up

I hope her sleep pattern has settled back down now I’d say she could have been having a growth spurt. If in doubt, never hesitate to ask your child health nurse, they’re usually more than happy to answer any questions.

They change all the time.

http://www.thealphaparent.com/2013/01/timeline-of-baby-and-toddler-sleep.html?m=1

•Some believe that the earliest your baby will be physically capable of sleeping through the night without a feed is around now (Laurent 2009). Personally I believe the very earliest is 4 months (as does Cave and Fertleman 2012) partly because at 6 weeks…
•Your baby’s second growth spurt will occur around this time prompting more night wakings.
•After the growth spurt you are likely to find that your baby sleeps longer for a day or two (Lampl 2011).
•The average 6 week old wakes 3 or 4 times per night (Galland et al 2012). This is a global norm.
•It’s a myth that you need to get your baby on a strict schedule from the get go, and doing so may be dangerous because his body is not developmentally ready to wait several hours between feeds or sleep periods.
•Not all babies have the ability to self-soothe at this age, so it’s important not to do any form of sleep training or ‘crying it out’.
•Take advantage of your baby’s portability at this age. Many babies like to fall asleep in their carriers, in the car, or in a pram, and will sleep just about anywhere – in a restaurant, at the cinema, at a friend or family member’s house. His ability to sleep well “on the go” will change significantly at 4 months, when he’ll need to begin getting better quality sleep in a quiet, darker environment.

Maybe she just has a bellyache, or she could be going through a growth spurt