My newborn not passing urine. Worried.

Hi, I am 33 years old and delivered my child at 35 weeks 5 days yesterday by c-section. Before delivery I had low amniotic fluid level of 6. My baby born healthy without the need of nursery. I have 2 concerns, first my baby is taking feed properly. Only a 1-2 ml of formula feed a time. Also he is not able breast feed too. Second, it is now more than 30 hours since he is born yesterday afternoon and has passed urine only once that was today morning. He didn't pass urine yesterday and not after morning today again. I have asked doctors few times about it, but I am not sure why i have not been answered by them if I should worry. He did pass meconium yesterday 3 times and once today, but did not urinate even at that time. Please suggest if I should be worried.