Blessings for a child
Make a prayer to Santhana Gopala by chanting the following mantra 108 times a day for 108 days after bath.
Santhana Gopala Mantra
Om Devaki Sudha Govinda
Vasudeva Jagath Pathe
Kadhahaa Deva Deva
Gothra Vridhi Karap Prabho
Dehimey Thanayam Sheegram
Ayushmandham Yashashreenam !
Nagaraja is the devata for Kudumba Vrithi. Perform Nagaraja pooja in your home by some learned priests.
Also visit Rameswaram, Devipattinam and the navagraha temples around Kumbakonam with your saha dharmini and make prayers to the devatas.
Mantra for a Child birth
This mantra may be recited for getting a son, or for childless couples, who want a child.
Devaki-sut Govinda Vasudeva Jagatpate
Dehi me tanayam Krishna Tvaamaham sharanam gataha
O Son of Devaki and Vasudeva, the Lord of the Universe
O Krishna! give me a son; I take refuge in you