Just went through it with my little girl she was born at 35 weeks 3 days baby will be fine its just a pain cause you wanna enjoy your baby. Do the formula instead if breast milk it helps alot with their bowl movements an also see if you can do billy blanket from home that's wheat they let me do, doesn't hurt to ask? Only thing with that is every morning for like 5 days had to take her for blood work. Good luck
My youngest was born with pneumonia and jaundice. Spent a week in nicu. She only had to do 24 hours phototherapy and she was born at 36 weeks
Our daughter had it so bad we had to stay in hospitsl for a week with her in a billi blanket (uv lite blanket). Shes nearly 2 now and fine
My daughter had jaundice problems as well its due to them not pooping out the beliruben its very common dont stress if your breast feeding it could be that your not producing enough for him to have poop so i would supplement with formula thats what the issue was with my daughter. Also because its been acouple days if hes been fussy have them check for urinary track infections on top of the dehydration