Re: Cannot find a rhythm
How old is your baby? In the beginning, it's totally normal not to have any kind of routine or rhythm. Even once baby is a bit older and starts to fall into a pattern, it's normal for that pattern to switch up and change on a regular basis.
If the weight gain was fine and you were getting plenty of wet and dirty diapers I'd say 'never wake a sleeping baby.' But in this case, if you are already having issues with supply, yes I think you should be waking baby every 3 hours at night to feed her. This is not only to get food in her, but also to get your supply up and established at a level where it is sufficient to feed the baby. If you are going several hours at night without nursing OR pumping that is having a negative affect on your overall supply.
Also, unless diaper output drop significantly during growth spurts I would suggest you handle it by nursing more frequently rather than supplementing more formula. It is completely normal for baby to want to nurse frequently, it may even feel like constantly, when going through a growth spurt. That is baby's way of boosting your supply to the level that they need. It's also completely normal for babies to cluster feed in the evening. It DOESN'T mean baby needs formula. What the formula does is settles in the tummy more thickly than breastmilk and digests much slower so it makes baby feel full longer.
Having said all that, if you are only supplementing 2 oz per day, that isn't all that much. It actually doesn't sound to me like you really have supply issues at this point as much as maybe a confidence issue (and of course a toddler issue ). You are doing great so far, don't feel like you aren't. Try dropping the formula (one ounce to start with) and watch the wet diapers carefully over a couple of days. Nurse on demand, as often as baby wants (even if you keep getting interrupted, just go back to it when you can), try waking her at night and see if that helps.
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