Putrakameshti

Putrakameshti is a special Yajna performed in Hinduism for the sake of having a child. It is a kaamya-karma. 
In the Ramayana, upon the recommendation of Sage Vashishta, King Dasharatha of Ayodhya performed the Putrakameshti Yajna under the supervision of Rishishringa Muni, who was an expert in Yagur Veda, which has the guidelines for this prayer. After its successful completion, the Lord of Fire, Agnidev appeared and gave a bowl of sweet to the King of Ayodhya, which was provided to his three queens in order to promulgate his sons Sri Rama, Lakshmana, Bharata and Shatrughna.
Putrakameshti
te:పుత్రకామేష్టి