The other day Jonathan asked to use the toilet. He added a few drops of liquid but wasn't able to get the other stuff past his cheeks and needed to be cleaned up. It was funny to see him trying, in a weird sort of parent way. His current diet might delay his learning since everything is still pretty soft, but at least he's asking. He hasn't asked since, but I think he's at least gotten the concept. That's a good starting point.
He's been sick for the past few days. There's definitely something going around since we all had it last week. For me it was a sore throat, but Jonathan seems to have a runny nose and possibly something more. His system has slowed down considerably and he's been coughing a lot due to his cold. Both of those complications have made feeding him a challenge, since both cause him to throw up. Even on relatively good days he's done something like drop the iPad on his face, causing him to cry and then give back his latest feeding. We're just trying to manage this time until he gets over this latest illness.
We're probably going to follow through and see a cardiologist just to rule it out. Heart issues can definitely cause feeding and growth issues, so it's probably a good idea we rule it out before he gets too much older.