BOTTLES/NIPPLES

Courtney • FTM preterm labor at 25 weeks. DOB 8/19/15 at 32w2d.She was in the NICU for 1m3d. She's now 17 months old!
What kind of bottles and what size nipples do you use for your preemie? Please include their age, how much they weigh, and also the amount they eat per feeding. 
Thanks!