BF - is DS getting enough in his speedy snacks?

[JimJammum]

DS is now 13 weeks old and is bf except for one bottle a day at dream feed.He has about 5-6 oz from bottle in about 15 mins. When he was newborn, he would feed for about 20 mins per session, which has reduced now to about 8 mins every three hours. He is still putting on 3-4 oz per week, and lasts the 3 hours between feeds OK, but is still waking twice per night and munching away happily (usually for longer though I think some of it is comfort munching!) . Could it be he's not eating enough in the day in these speedy feeds, as I can't see how he's getting 5-6oz in 8 mins?

I have a smiliar problem - ds (11 weeks)feeds are really quick (roughly 10 mins), and was wondering about if he is getting enough too.

But today, I gave him a vari-flow teat on his bottle (he has 2 per day of EBM), and he downed 3 oz in 5 mins. So, assuming vari-flow is more indicative of breast flow than a slow/medium teat, I reckon he could be getting about 6oz in a 10 mins feed.