Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 7 · Samskara Muhurtas
संस्कारमुहूर्ताः
सप्तमे मासि वा कार्यं नवान्नप्राशनं शुभम् ।रिक्तां दिनक्षयं नन्दां द्वादशीमष्टमीमथ ॥ ३३१ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 331.
Or for girls in the 7th month, do the good annaprashana (first feeding of grain). Leave out the rikta (empty tithi) days, a lost day, Nanda, the 12th and the 8th.
Simple meaning: The first grain feeding is done in the 7th month, on days other than empty, lost, Nanda, 8th and 12th moon days.
त्यक्त्वान्यतिथिषु प्रोक्तं प्राशनं शुभवासरे ।
Do the feeding on a good weekday and a good star, with a clean 8th house.
दशमे शुद्धिसंयुक्ते शुभलग्ने शुभांशके ।
A good rising sign, a clean 10th house and a good planet joined or looking at it help this rite.
त्रिषष्ठलाभगैः क्रूरैः केंद्रधीधर्मगैः शुभैः ।
Bad planets in the 3rd, 6th and 11th and good planets in strong houses make the first feeding good.