your solid baby may be stealth tobiano. Do you have a photo?
Yes, I definitely have photos.
I don't know if I have any that show the ermine spots well, but I will take a look and post the best photo or photos. He actually has ermine spots on both hind legs, but it only shows up on one leg in my photos. His only face marking is a tiny star. Mom is a Foxtrotter and she has thrown spotted foals (according to registry records) but I always assumed that must have came from the other foal's sire(s) because the mare herself doesn't appear spotted (she's a gray). This particular foal's dad was a chestnut QH, solid in color, so I am pretty sure he isn't hiding tobiano.
That would be weird if tobiano came from mom, because she has thrown spotted foals before I owned her, but she doesn't look tobiano in any way to me.
Okay, and below my foal's photos are a gelding I almost bought, but he had a bad chronic hoof crack so I didn't get him. But he had really cool ermine spots.
Hey, I have one other question, and that would rule these guys out as a hidden tobiano anyway, and that is: Do tobianos have to have four white socks? I think there are rare exceptions, but I have heard that basically, tobianos always have four socks, correct?