Charak Samhita
मात्रादीनामेव तु खलु गर्भकराणां भावानां व्यापत्तिनिमित्तमस्याजन्म भवति ॥२८॥
Due to the abnormality in the mother (ovum), father (sperm) etc. factors accountable for the creation of the fetus leads no birth of the child.
english translation
mAtrAdInAmeva tu khalu garbhakarANAM bhAvAnAM vyApattinimittamasyAjanma bhavati ॥28॥
hk transliteration by Sanscript