Toe walking in children (walking on tip toes) Many children walk on tip toes and this can be a normal part of their development. It is more common in boys and it can sometimes be seen in several family members. It is common for children of 10-18 months to walk on tip toes when they are learning to walk as it can help with their balance.
https://www.oxfordhealth.nhs.uk/podiatry/wp-content/uploads/2013/12/Toe-walking-in-children.pdf