two month old night feedings and sleep

So since we hit the 8 week growth spurt my little one has varied in the nap department and def regressed in night time sleep. She used to sleep a five hour stretch and then do a four hour and now we are lucky if she sleeps a three hour stretch when we put her down for the night. She has increased to five oz (formula fed) and tonight I gave her 6 oz because she seemed unsettled after 5 despite burping and sitting her upright for 30 mins (she has reflux)  she fell asleep quickly after this ..