Bottle feeding questions!! please help!!

i know my peditritian said feed him as much as he needs but i'm still a little worried about overfeeding. i see her monday but, if anyone can help calm my fears, pleease give me your advice!!

my son is 1 week 6 days old, 7 ibs 11 oz, 21 in long, and has gone from eating (formula) 1 ounce in the first couple days in the hosptial to 2 when we left (i was there for 3 days b/c of a c-section), 2 for the first week. now it seems like his schedule has changed a bit. he was still sucking on the bottle after feeding him 2 oz and so i gave him a 1/2 to an 1 ounce to see if that would safice, it did but now since yesterday afternoon he wants 2 1/2 to 3 every 2-3 hours. is this normal or is something wrong???