Honestly, it can take a few shed cycles to identify which babies have Congo and which do not. On its own, Congo has a slightly lighter green look to the body color and slightly more crisp black. In combinations, you have to look for subtle changes. Congo generally lightens up a combination and removes black speckling in the body color. I have only worked a little bit with Congo and found the comparison in the Fire gene one of the more observable. Please look at my thread on the Congo Fire. It has a lot of good comparison pictures.

https://ball-pythons.net/forums/show...119-Congo-Fire

When you hatch out babies, you will have to wait for them to shed and compare how they each look in order to have a good chance to see which, if any, babies got the Congo gene. I am waiting for my babies from a Pastel GHI to the female Congo Fire that I kept in the above thread. I intend to post pictures of them when I get some time (I will post pictures on our Facebook page, but it may take some time to write up another thread on the new babies).