2 Days Post Op

Our LO had his surgery at 5months old to close the PM VSD 7mm. Now he is in the nicu. Vitals are stable but had a fever 37.9 after the surgery. Now it is 36. Surgery was a success as the echo’s done post op are normal. Surgery was done on 6th Dec and we are on 2nd day post op. He currently has one tube for lungs drains and is on CPAP. Most important the heart is working fine the surgeon said. They gave him 15 ml of feed on 7th Dec which he tolerated. But they said that since he is on CPAP they have stopped the feed unless he takes all the oxygen on his own. Also they plan to remove the drain tube. With this scenario how many days of PICU stay should we expect? Has anyone had the same kind of recovery? What we need to ask more to the PICU personnel? We are getting stressed about whether he is having a fine recovery? The PICU personnel did not say anything negative and everything is fine but only thing is regarding him taking his own oxygen. Otherwise the baby is very much active as we seen him cooing making noises. Lifting and playing with hands and legs. But cries briefly for some time and then settles. Is there anything we need to stress about this situation and crying? Please share your experiences.