[For a male]
اللَّهُمَّ اجْعَلْهُ فَرَطًا وَذُخْرًا لِوَالِدَيْهِ وَشَفِيعًا مُجَابًا ،اللَّهُمَّ ثَقِّلْ بِهِ مَوَازِينَهُمَا ، وَأَعْظِمْ بِهِ أُجُورَهُمَا ، وَأَلْـحِقْـهُ بِصَالِـحِ الْمُؤْمِنِينَ ، وَاجْعَلْهُ فِي كَفَالَةِ إِبْرَاهِيمَ ، وَقِهِ بِرَحْمَتِكَ عَذَابَ الْجَحِيمِ
[For a female]
اللَّهُمَّ اجْعَلْهَا فَرَطًا وَذُخْرًا لِوَالِدَيْهَا وَشَفِيعَةً مُجَابَةً ،اللَّهُمَّ ثَقِّلْ بِهَا مَوَازِينَهُمَا ، وَأَعْظِمْ بِهَا أُجُورَهُمَا ، وَأَلْـحِقْـهَا بِصَالِـحِ الْمُؤْمِنِينَ ، وَاجْعَلْهَا فِي كَفَالَةِ إِبْرَاهِيمَ ، وَقِهَا بِرَحْمَتِكَ عَذَابَ الْجَحِيمِ
اللَّهُمَّ اجْعَلْهُ فَرَطًا وَذُخْرًا لِوَالِدَيْهِ وَشَفِيعًا مُجَابًا ،اللَّهُمَّ ثَقِّلْ بِهِ مَوَازِينَهُمَا ، وَأَعْظِمْ بِهِ أُجُورَهُمَا ، وَأَلْـحِقْـهُ بِصَالِـحِ الْمُؤْمِنِينَ ، وَاجْعَلْهُ فِي كَفَالَةِ إِبْرَاهِيمَ ، وَقِهِ بِرَحْمَتِكَ عَذَابَ الْجَحِيمِ
[For a female]
اللَّهُمَّ اجْعَلْهَا فَرَطًا وَذُخْرًا لِوَالِدَيْهَا وَشَفِيعَةً مُجَابَةً ،اللَّهُمَّ ثَقِّلْ بِهَا مَوَازِينَهُمَا ، وَأَعْظِمْ بِهَا أُجُورَهُمَا ، وَأَلْـحِقْـهَا بِصَالِـحِ الْمُؤْمِنِينَ ، وَاجْعَلْهَا فِي كَفَالَةِ إِبْرَاهِيمَ ، وَقِهَا بِرَحْمَتِكَ عَذَابَ الْجَحِيمِ
Translation 
After seeking forgiveness for the deceased, one can say:
O Allah, make him a preceding reward and a stored treasure for his parents, and an answered intercessor. O Allah, by virtue of his death, make heavy his parents scales and magnify their reward. Unite him with the righteous believers, place him under the care of Ibrahim (peace be upon him), and protect him by Your mercy from the torment of Hell.
Note: This supplication is made when the deceased is a baby/child (i.e. who hasn't reached puberty).
O Allah, make him a preceding reward and a stored treasure for his parents, and an answered intercessor. O Allah, by virtue of his death, make heavy his parents scales and magnify their reward. Unite him with the righteous believers, place him under the care of Ibrahim (peace be upon him), and protect him by Your mercy from the torment of Hell.
Note: This supplication is made when the deceased is a baby/child (i.e. who hasn't reached puberty).
Transliteration
[For a male]
allaahumm-aj‛alhu faraṭan wa dhukhran li waalidayhi wa shafee‛an mujaab-an, allaahumma thaqqil bihi mawaazeenahumaa, wa a‛ẓim bihi ujoorahumaa, wa alḥiqhu bi ṣaaliḥil-mu’mineena, wa j‛alhu fee kafaalati ibraaheema, wa qihi bi raḥmatika ‛adhaab-al-jaḥeem
[For a female]
allaahumm-aj‛alha faraṭan wa dhukhran li waalidayha wa shafee‛atan mujaaba-tan, allaahumma thaqqil biha mawaazeenahumaa, wa a‛ẓim biha ujoorahumaa, wa alḥiqha bi ṣaaliḥil-mu’mineena, wa j‛alha fee kafaalati ibraaheema, wa qiha bi raḥmatika ‛adhaab-al-jaḥeem
allaahumm-aj‛alhu faraṭan wa dhukhran li waalidayhi wa shafee‛an mujaab-an, allaahumma thaqqil bihi mawaazeenahumaa, wa a‛ẓim bihi ujoorahumaa, wa alḥiqhu bi ṣaaliḥil-mu’mineena, wa j‛alhu fee kafaalati ibraaheema, wa qihi bi raḥmatika ‛adhaab-al-jaḥeem
[For a female]
allaahumm-aj‛alha faraṭan wa dhukhran li waalidayha wa shafee‛atan mujaaba-tan, allaahumma thaqqil biha mawaazeenahumaa, wa a‛ẓim biha ujoorahumaa, wa alḥiqha bi ṣaaliḥil-mu’mineena, wa j‛alha fee kafaalati ibraaheema, wa qiha bi raḥmatika ‛adhaab-al-jaḥeem
