This is something that I know a lot about.
My DS now 9 1/2 has been a toe walker all his life. I took him to the ped and family doctors who all said he'd grow out of it. "involve him in sports, get him in ballet" etc. I heard it all. I did get him in gymnastics but he didn't really like it and he's played soccer for 5 years. He's always on defense since he can't run as fast as the other kids. He had other issues as well such as ear infections, asthsma, stomach/bowel, poor fine motor. Every Dr appt I would ask if these were related in any way and was always told "NO" For 9 years I was told that they were unrelated and then he started having issues in school.
We thought he was goofing off and didn't want to do the work and just basically being lazy. Homework time was a nightmare and he usually ended up in tears. The last 2 years have been horrible. The older kids get the meaner they get. He started being called "Tippy toe boy" and was always being asked why he walked like THAT.
He was miserable. I was miserable.
I decided to hell-o with the regular doctors. I was going to a specialist. This was this past May. The Dr asked some questions and then checked the range of motion in his feet. He then asked about his birth. I didn't know what that was all about but I told the Dr. that his heart rate dropped and he had to have the suction cuppy thing put on his head to get him out. He got a hematoma and became jaundiced and had to be re-admittd to the hospital and under the bili lights.
The Dr looked at me and said without hesitation that my DS had suffered a brain injury at birth and has a mild case of Cerebral Palsy.

Look up the defintion of CP. It describes my DS to a T.
He then went on to say that my DS needed surgery to lengthen the tendons in his calves. We did the surgery and the pain was so bad that he had to be admitted to the hospital. He wore 2 casts for 5 weeks and then when they came off started PT 2x a week. He was also fitted for braces and wears them for 10 hours a day.
School begins in a week and a half and the teachers have been informed about the CP and the surgery. He will be classified and get the extra help that he needs. He's not lazy-it's medical.
Not every child that is a toe walker has CP. Some just have tight achillies or calf tendons. Mild cases of CP usually aren't diagnosed until later after the child has started school.
I did everything right. I questioned every doctor that my DS has EVER seen. No one ever put it all together and my DS has suffered for it.
Please and I can not stress this enough.....Please have your child see by a Pediatric Orthopedist as soon as you can.