Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · Signs, Planets, Birth
जातकम् १
मासानां तत्समं वाच्यं गर्भस्थस्य शुभाशुभम् ।त्रिकोणे ज्ञे परैर्नष्टैर्द्विमुखाह्निकपान्वितः ॥ ५९ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 55, verse 59.
The good and bad of the child in the womb is told month by month from those lords. Mercury may be in a trikona (luck house), with the others weak. Then the child has two faces ... (Our text is unclear here: the words after 'two faces' are damaged.)
Simple meaning: Each month of pregnancy goes well or badly by its lord. Mercury in a luck house can bring a deformed child.
Classical view, not medical advice.
आरार्की चेज्यभांशस्थौ सदंतोगर्भकस्तदा ।
Some planet places can give a child born with teeth, hunchbacked or lame.
पापैर्जडो विधौ गर्भः शुभदृष्टिविवर्जिते ।
Bad planets can make a child slow to learn. A late Capricorn lagna seen by Saturn, Moon and Sun gives a dwarf.
रवींदुयुक्ते सिंहेंगे माहेयार्किनिरीक्षिते ।
The Sun and Moon in Leo in the lagna, seen by Mars and Saturn, can give blindness.