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The "Putra Kameshti Yagnya" is much old Ygnya dscribed in holy scriptures of Hinduism. It was done by the King Dasharatha the father of Lord Rama after which he could procreate four sons viz. Rama, Laxmana, Bharata, & Shatrughna through his four Queens. This type of Ygnya is not quite impossible in these days also, and not much costly also. If you will please visit the ancient cities like Tryambakeshwar, Nashik, Ujjain, Varanasi, there you will find the preasts who are competent engough to perform such type of Ygnya. I am having a marathi book, in which the simple way of performing this type of yagnya is described. The title of this book is "Shastra Ase Sangate" compiled and published by Mrs.Mrinalini Deshapande, Vedwani Publications, Phulewadi, Kolhapur - 416010 (Maharashtra), Phone Nos. 0231-2622745, website address:- www.vedwani.com, www.phadkebooks.com, e-mail:- firstname.lastname@example.org. Therefore, go ahead & best luck. Having procreated no sons, and only daughters is considered to be lacuna in our Hindu way of thinking. Such types anomalies of fate are wiped out by performing such type of Ygnya. But nobody can be sure of the results after performing such Yagnas. There are other ways of having a male child developed by latest scientific developments. But the doctors who practice such new way of science also do not vouch for the definite results. I have put both options before you.