Prophet (SAW)'s Prayers

When eating new fruit of the season
اللَّهُمَّ بَارِكْ لَنَا فِي ثَمَرِنَا وَبَارِكْ لَنَا فِي مَدِينَتِنَا وَبَارِكْ لَنَا فِي صَاعِنَا وَبَارِكْ لَنَا فِي مُدِّنَا
"O Allah, grant blessings in the fruit and grant blessings in our city and grant blessings in the weighing of our harvest (flour)".
After the dua give the fruit to the youngest child.

(Hisnul Hasin)
Alternatively give it to the youngest child in the gathering at that time.

(Hisnul Hasin)