Imam Ja'far as-Sadiq (a.s.) has taught the following dua:

بِسْمِ اللهِ الرَّحْمنِ الرَّحِيْمِ

اَللّهُمَّ لاَ تَذَرْنِيْ فَرْدًا وَّ اَنْتَ خَيْرُ الْوَارِثِيْنَ وَحِيْدًا وَّ وَحْشِيًّا فَيَقْصُرُ عَنْ تَفَكُّرِيْ بَلْ هَبْ لِيْ عَافِيَةَ صِدْقٍ ذُكُرًا وَّ اُنَاثًا انَسُ بِهِمْ مِنَ الْوَحْشَةِ وَ اَسْكُنُ اِلَيْهِمْ مِنَ الْوَحْدَةِ وَ اَشْكُرُكَ عِنْدَ تَمَامِ نِّعْمَةٍ يَا وَهَّابُ يَا عَظِيْمُ يَا مُعَظَّمُ ثُمَّ اَعْطِنِيْ فِيْ كُلِّ عَاقِبَةٍ شُكْرًا حَتّى تَبْلُغَنِيْ مِنْهَا رِضْوَانُكَ فِيْ صِدْقِ الْحَدِيْثِ وَ اَدَاءِ الْاَمَانَةِ وَ وَفَاءٍ بِالْعَهْدِ

Translation: O Allah! Do not keep me solitary though You are the best of Inheritors. I am alone and terrified of loneliness. This worry has reduced my thankfulness to You. So bestow on me true forgiveness and give me female and male children so that by their company I can cure my terror of loneliness. By which my loneliness is cured. So that on the completion of this bounty I can thank You. O the greatest Giver, O the Greatest, O the Bestower of greatness, after this bestow me with tawfeeq that I thank You for every kindness. Till I can achieve Your kindness by thankfulness, by speaking the truth, by returning trusts and by fulfilling oaths