Vidyes'vara Samhita - Chapter 16 - Verse 9

cartika, or on (the first day of the said month) 7 the yatipata-yoga, during the constellation 1 the birth or on the full moon day, Janma- aivedya should be got prepared, or otherwise vhen the constellation of the birthday falls in ny other month, or when the Parna-yoga is re, one should arrange for the Janma- aivedya.