A 5-month old baby not sleeping through the night is very normal. Of course, all babies are different, and some may sleep through the night--but it is very unusual for a breastfeeding baby to sleep through the night that young. My son just started sleeping through the night--he just turned one. And I would consider him a good sleeper!
That said, obviously this babe has other things going on that may definitely be waking her more than she usually would!
You've gotten a lot of good advice. Hang in there! I know how it feels to think that you are losing your mind with a young babe!
Don't give up breastfeeding. Get help if you need it. There is no formula in the world that will "fix" anything. Solids are not necessary before 6 months at the earliest--and feeding solids at this point will only increase her chances for developing allergies later on. There could be, of course, something in your diet that she is reacting to, like so many others have pointed out. However, this is actually pretty rare. It would be more likely that colicky symptoms caused by your milk are caused by an oversupply--if you have an oversupply, your babe would be getting too much of the lower-fat, higher lactose foremilk and not enough of the higher-calorie hindmilk. This could also cause her to be fussy and never seem satisfied, as the foremilk is just a thirst quencher and not very good at satisfying hunger! But this can be corrected. Find a good lactation consultant (an IBCLC one). They can make a world of difference! And know that there is a light at the end of the tunnel--this will get better.
www.kellymom.com is a great resource! I would search here for oversupply and foremilk-hindmilk inbalance.
On another note: yes, there is lactose in breastmilk, but a baby wouldn't have a reaction to that--it is not "milk". Breastmilk is tailor-made for a baby's digestive system. It's the lactose and other things in non-human milks that give us tummy troubles! They could get too much lactose if, like I pointed out above, they are getting too much high-lactose foremilk instead of a good balance of both foremilk and hindmilk.
That said, obviously this babe has other things going on that may definitely be waking her more than she usually would!
You've gotten a lot of good advice. Hang in there! I know how it feels to think that you are losing your mind with a young babe!

www.kellymom.com is a great resource! I would search here for oversupply and foremilk-hindmilk inbalance.
On another note: yes, there is lactose in breastmilk, but a baby wouldn't have a reaction to that--it is not "milk". Breastmilk is tailor-made for a baby's digestive system. It's the lactose and other things in non-human milks that give us tummy troubles! They could get too much lactose if, like I pointed out above, they are getting too much high-lactose foremilk instead of a good balance of both foremilk and hindmilk.
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