falling asleep whilst feeding from a bottle is a good indicator shes had enough. I dont know how much DD was having at 2 weeks as she was BF but i do remember expressing around that time and it would be 60-80 mls. Ide stick with the 80 mls, and let her decide when shes hungry. Ive forgotten how they work it out by weight... ill find it for u.

U wont need to change the teat unless u think shes struggling getting it out, so cheeks sucked it, squirmish etc.

ill find that info and brb