What Formula Milk Can My Preterm Baby Take Instead Of PRENAN?

Good afternoon! i would like to ask i gave birth to my baby at 32 weeks and 5 days. Today he is 1 month and 1 month and 16 days. He was advised to take PRENAN formula milk. His weight is currently 2.7 kgs. Can i ask for advise if what milk can he switch to drink aside from PRENAN? Thank you.