Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · Signs, Planets, Birth
जातकम् १
तन्वस्तसंस्थयोर्भौमरव्योः शस्त्रभवः क्षयः ।यन्मासाधिपतिर्नष्टस्तन्मासं संस्रवे त्यजेत् ॥ ४९ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 55, verse 49.
Mars and the Sun stand in the lagna (rising sign) and the 7th. Then there may be a risk to life from a weapon. Whichever month's lord is weak, in that month the child in the womb may be lost.
Simple meaning: Mars and Sun in the lagna and 7th can bring harm by a weapon. A weak month lord can bring miscarriage.
लग्नेंदुगैः शुभैः खेटैस्त्रिकोणार्थास्तभूखगैः ।
Good planets in good houses, bad ones in the 3rd, 6th and 11th, and the Sun's look give a happy pregnancy.
ओजभे पुरुषांशेऽर्केज्येंदुलग्नैर्बलान्वितैः ।
A boy is born when these planets are strong in odd signs and male navamsha.
युग्मभांशस्थितैस्तैस्तु वक्रेंदुभृगुभिस्तथा ।
A girl is born when those planets are in even signs, or Mars, Moon and Venus are in even places.