Dear Mr. Amit,
As per Section 64(1A) of the Income Tax Act 1961, income of the minor child is to be clubbed in the hand of either of his/her parents, however if that income is earned by the child on account of the manual work done by him or from any activity involving application of skills, talent or specialised knowledge or in case of child with disability then income will be taxed in the hands of child only.
Hence if the income is derived by any mode other than above mentioned three cases then it is not advisable to file separate return of the child.
But as a tax planning measure one can form HUF.