I had a similar thing happen when my LO was born. I have to use a nipple shield and my LO was not latching and jaundiced, and it took a while for my milk to come in. However after we got home with the hospital and I kept using the shield it got much better. Now we have no problems at all. My milk came in about 4 days after he was born and prior to that I just had very little colostrum coming out. Good luck, I hope your LO is ok!
Lurking here. This is similar too my story for DD1 too. She would not eat and I had no milk yet, so we supplemented at the hospital. I pumped and used the nipple shield. After a few weeks I got rid of the shield and ended up BFing for 8 months. Supplementing now does not mean you won't be able to continue BF. Good luck!