My baby just turned 3 months and was snacking the whole day on Philip avent anti colic nipple 2 (1m+), just couldnt follow the scheduled feeding - ate 2 oz every 1 or 2 hrs, max 3 oz at one go.
I changed to nipple 3 (3m+), she gulped down 4 oz in 6 mins total.
First 2 oz in 3 mins, Burp break...