Emily's temperature was always 36.2 even with five blankets, swaddled, vest, sleepsuit, hat, and cardi...I swear the thermometers were rubbished as she always felt toastie so don't worry too much about it.
As for the weight loss, it is probably just Andrew settling into BF.
Have fun taking Andrew out, the first time people see the actual size of your baby (like Foogirl says), they can't believe it, I think you will get stopped in your tracks several times for people to coo and admire him. Even now Emily is 9lb, we still get stopped in Tescos by staff and customers who admire her as a newborn.
Wait until you tell them how old he is, watch their jaws drop to the floor, it is so funny!
Have fun and enjoy every minute of your time together...they grow so quickly once they are home....x