Hi, thanks for writing to HCM. By your description, it seems nothing serious or nothing to panic. Generally, at the age of 18 months majority of the small bones (carpal bones) at the wrist are cartilagenous and they wont show up on xrays. This might be the reason why the attending doctor has not ordered for an xray. As your son is using his injured hand ocassionally, it rules out any major
fracture.
Even if a minor hair line fracture is present, it heals without any issues as children will have excellent osteogenic (bone forming) potential and it heals within 3 weeks. Hope this alleviates the
anxiety in you. Have a great day