Breastfeeding

Felecia
Can any moms give me some advice on breastfeeding? My baby girl spent 16 days in the NICU so I pumped for her and continue to do so to ensure she is getting enough. I was supposed to get to practice breastfeeding with the lactation specialist before she went home but I got an infection in my uterus and had to be on antibiotics for a few days and she could not have my milk so I did not get that time with the lactation specialist while at the hospital. They said I could practice with her for now until I know she is getting enough to exclusively breastfeed but I'm not having much luck 😕 she will latch and suck for a few seconds but then seems to get frustrated. She did pretty good at one point yesterday but still only did it for a few minutes and I have no way of knowing how much she got. I'm trying not to stress over this because I know it will not help matters but I want to be able to exclusively breastfeed. Any suggestions would be greatly appreciated!!!