A minor child cannot sign or enter into a contract.
However his/her guardian can enter into a contract on behalf of the minor and the said guardian need not obtain permission form the minor for this act, also any such permission obtained from the minor for this purpose is also not valid.
Under certain circumstances, a guardian of a minor can enter into a valid contract on behalf of the minor. Such a contract, which the guardian enters into, for the benefit of the minor, can also be enforced by the minor. However, guardians cannot bind a minor by a contract for buying immovable property.
A guardian of a minor cannot bind the minor by an agreement for the purchase of immovable property ; so the minor cannot ask for the specific performance of the contract which the guardian had no power to enter into.
Therefore, for contracts with minor to be legally enforceable, a guardian, who is major is needed. Ratification of transaction is accepted once a minor has attained the age of majority as per the section 196, 197 and 198 of the India Contract Act of 1872.