How many oz of milk does your 8 week old drink?

So me and my cousin had this argument because she saids that babies that are 2 months old are supposed to drink from 2-3 oz only e and that I am over feeding my babies because they are starting to drink 5oz of formula, mind you it started yesterday.

They were drinking 4oz every 2-3 hours but now they are drinking 5 oz every literally 5 hours and I explained to her that I was feeding them 8 oz in 4-5 hours and now they are just drinking 5 which I believe that in that time frame is better and they are sleeping more at night.

Last night I gave both of them 5oz before 8pm. They both went to sleep before 11pm and they both woke up around 1isham to drink milk. They drank 5oz and went right back to sleep until now 6AM. If they would of been drinking 4oz they would of woken up at least 3 times from 11pm until now 6AM.