Maybe move it to next weekend if baby is better
You have the right to cancel…. It is okay to do as you got a cogent reason.
I would talk to him and let him know what's going on. If he really wants him that bad, try and see how he does with you there. If that doesn't work then let him know you're uncomfortable sending the baby to him due to the current circumstances.
Talk to the dad about what’s going on with your son to see if he wants to reschedule for a different day. But if he doesn’t want to then let him be a dad. Fathers have the same responsibility as the mom. He is also the parent.
Yeah I would cancel. I feel like you deffo know your LO better and can probably comfort them well