When he was six weeks he was eating about 4oz of BM in a bottle when we had to give it to him that way.....when BF there is no way to know exactly how much they are eating. Hope this helps!
I feed on demand mostly, and she'll take essentially 1-2 oz every hour (meaning, if she goes three hours, she'll take between 3 and 4 oz - if she goes 2 hours, she has 1-3 ounces)
Re: How many ounces is your 6 week old eating?
It's a week ahead but:
https://community.thebump.com/cs/ks/forums/thread/23428145.aspx
Mine is eating the same about as yours.
Id say it is 50/50 between the amount she drinks with 4oz bottles and 3.5 oz bottles.
We're currently attempting an every 4 hour schedule but were not quite there yet