my baby has similar problem starting from two weeks ago.
today, he drank 2 oz at 7:00 (he drank 5 oz at 23:30 last night) and then started crying. after burping, he started crying again when my maid tried to feed him again.
then he refused to drink the milk at 11:00.
At 12:35, he felt hungry but only drank 3oz and started crying again.
i m afraid he started 厭奶 see http://www.baby-kingdom.com/modules/newbb/viewtopic.php?topic_id=857530&forum=157&33
this morning he refused to drink again and started crying. i put him onto the rolling chair and calmed him down. then fed him on the rolling chair (adjusted one level up) and it took an hour to finish the 5 oz.
i m using Avent No. 2 nipple. i m thinking whether i should buy the No.3 nipple and sterize them first. according to the instruction, it should be used for 3M+
my friend whose son is 2 yrs old told me that her son had similar problem when he was around 2 months.
she said:
1)to check if he has air (can use a silver ring with boiled egg white to "roll" on his tummy to see if the silver turns to blue )
2) to check if his anus is red or not (if red, "hot air") if it's because of hot air, try to dilute the milk w/ more water
3) may be it's an adjusting period, usually around 1 wk. if after 1 wk, resumes normal, then should be adjusting period
4) if not because of 1), 2) or 3), ve to design to change the milk
she said as my baby is eating A+ (i did not have any breast milk after the first month), it's quite likely that the problem is because of milk as A+ is not so easily adapted (his son changed the milk eventually)