In the womb, amid urine and faeces, one's sojourn is governed by Nature. The born creature is not free in the matter or residence therein or escape therefrom. In fact, in these respects, he is perfectly helpless.
गर्भे मूत्रपुरीषाणां स्वभावनियता गतिः। धारणे वा विसर्गे वा न कर्ता विद्यते वशः॥