Vaishnava Samhita. Chaturbhujadasa Charitam. Vol III Book VII Chp 12 Shlokas 3 - 4

गर्भस्थितोपि यो जीवः प्राप्नोति महतां कृपाम् |

प्रह्लाद इव सोप्येवं लभते जन्म वैष्णवम् ||

भगवत्पार्षदांशेन जगत्यवतरन्ति ये |

सौमित्रिरिव ते नूनं जन्मना वैष्णवाः स्मृताः ||

That soul which obtains the blessings of virtuous and great men, even while in the mother's womb, gains a life as that of Prahlada.Those who take birth as the manifestations of the parshadas of Bhagavan (the attendants of Shri Bhagavan) are born vaishnavas like Lakshmana.