Hairline fracture foot child no cast?

Yes and no. It will depend where the broken bone is and the stability of the hairline fracture. If it is in an unstable region, a cast (and possibly nonweight-bearing) may be a good choice.

Related Questions

Should you get a cast if you have a worsening hairline fracture in your ankle?

Perhaps. Talk to your podiatrist or orthopedist if immobilization ( a cast, cam walker) and/or offloading (crutches) may be needed. Your doctor can talk about your treatment options. Read more...
If it is getting . Worse you need to examine why....If walking too much, a cast would help prevent this..... Read more...
May benefit. A cast or a rigid walking boot may be used in such a situation. Read more...

Have radius hairline fracture from 6wks ago but was only in cast for 2wks. X-Rays show it's still broken- have I spent 4wks damaging it long term?

No. You need to speak to your doctor and see what his plan is. How does the arm feel? Go right back to this doctor . Read more...
Probably not. As long as it is not displaced, it is unlikely any harm has occurred. Don't hesitate to discuss with your doctor. Read more...