hi babysparkz, congratulations on the arrival of your little bundle of joy!!
(1) as for burping, my dear son was also like that. he doesn't burp because he is sleepy. sometimes he doesn't burp but if the gas builds up in his tummy he will start to cry then i will manage to burp him. but i'll always try my best to burp him before i put him down. sometimes i can spend as long as 5-10 min patting his back just to get him to burp.
(2) 27 should be ok. my dear son sleeps in aircon 26 degrees. my dear son also sneezed a lot but pediatrician said that it's just his reflexes. try to clean your baby's room so that it's generallt dust free. my dear son will get stuffy nose if the room gets too dusty.
(3) wow... 90ml is a lot of a newborn. i put my baby on routine after his first week. ie, first week was feed on demand and after 1st week i feed him every 3 hours. i calculate how much to feed using a formula my pediatrician suggested.
for lower limit, take baby's weight multiply by 150ml divide by # of feeds a day
for upper limit, take baby's weight multiply by 200ml divide by # of feeds a day
that's the range to guide you so that you're not over feeding or under feeding your baby. this formula is only applicable when baby is on all milk diet.
(4) you should keep your baby warm but dont't make her so warm that she perspires. if she perspires in the air con room, the chances of her catching a cold is higher. just like if we went jogging and then entered an air con room, we could catch a cold more easily. to test if your baby is cold, you can feel her feet. if her feet are cold, she is cold. if her feet are warm, she's ok... sneezing is reflex reaction to the new world she's in. my dear son also shivers but he's really not cold. but if your baby's nose is running, then chances are, she is cold.
hope this helps. you're doing a great job! dont't fret.