@Katacara I don't see any limb deformities. He might have MBD, but I don't see it. To me, the casque looks like a deformity. He might have hatched that way. It just seems too even and too healed to be an injury such as a burn. Congenital deformities are fairly common and little is really known. Temperature variations during incubation can have an affect.
All that said, it is possible that he hatched with MBD because his mother didn't have the calcium and vitamin resources to put enough into the egg. That is quite common with veileds. It costs money to properly nourish mothers and veileds wholesale for about $8 a piece.
If I had just purchased a young veiled, I would assume he has MBD whether it is obvious or not. That means be super vigilant about his UVB and calcium.
You are lucky on two counts--you have a male so you don't have eggs to deal with that will deplete what calcium stores the baby has and it is summer. Get that baby out into natural sunlight early in the morning before it gets too hot. Be very careful to monitor the temperatures and the humidity very closely. Dappled light under a tree is also good because the area will be cooler and the baby can get in or out of the sun easily and the cage won't heat up. Hot and dry air kills babies really quickly. If you can get baby out for an hour every day, great, but if not try on the weekends. Any natural sunlight is a million times better than a bulb.
Also be aware that MBD is caused by things other than nutrition (calcium and Vitamin D3 from UVB). MBD can also be caused by kidney failure. Kidney failure is a huge problem with chameleons. It is often caused by chronic dehydration. Most pet owners keep their chameleons in basically desert environments and that is not how they want to be kept. Veileds developed in the Arabian Peninsula at a time when it was lush and green. A chameleon can dehydrate because the air is too dry even with access to lots of water and misting.
Good luck. He's very cute.
