She has been gaining roughly only 1 oz per week for the last 5 weeks. And obviously dropping in the percentile chart. Her total intake of milk (expressed breast milk in bottle) is about 20 oz per 24 hours, and at least half of the feedings is a struggle (takes in 2-3 oz, then stops, and have to try again in 30 mins and if we are lucky takes in another 2-3 oz). She does wake up 1-2 times at night for feeding.
She has no other signs of distress (except for waking of 5-6 times per night crying hard needing to be held).
Is this a reason for concern?