Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 7 · Samskara Muhurtas
संस्कारमुहूर्ताः
तृतीये पञ्चमे चाब्दे स्वकुलाचारतोऽपि वा ।बालानां जन्मतश्चौलं स्वगृह्योक्तविधानतः ॥ ३३५ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 335.
Do the chaula (first haircut) of children in the 3rd or 5th year from birth. Or follow one's own family custom. Use the way told in one's own household rules.
Simple meaning: A child's first haircut is done in the 3rd or 5th year, or as the family custom says.
सौम्यायने नास्तगयोः सुरारिसुरमन्त्रिणोः ।
Do it in the Sun's northward course, on a Monday, Wednesday, Thursday or Friday.
दस्रादितीज्यचंद्रेन्द्रपूषभानि शुभानि च ।
Good stars for a first haircut: Ashvini, Punarvasu, Pushya, Mrigashira, Jyeshtha, Revati, Hasta, Chitra, Swati, Shravana, Dhanishta, Shatabhisha.
पट्टबंधनचौलान्नप्राशने चोपनायने ।
The birth star is good for these four rites and bad for other rites.