Another reason behind the practice is that the grandparents can show off their grandchildren to friends and relatives.
اَلسَّبَبُ ٱلْآخَرُ لِهٰذَا ٱلتَّقْلِيدِ هُوَ أَنْ يُرِيَ ٱلْجَدُّ وَٱلْجَدَّةُ ٱلطِّفْلَ لِلْأَصْدِقَاءِ وَٱلْأَقَارِبِ .‏