Heart-wrenching moment schoolgirl struggles with backpack overloaded with surprise gift for her moth

This is the heart-wrenching moment a schoolgirl tumbled over while she struggled to carry a heavy backpack stuffed with a surprise gift for her mother - before a kind passer-by helped her.

The exhausted youngster Aina Sota, 7, filled her rucksack with the 36 milk boxes - all free snacks she received from school - that she wanted to surprise her mum with but she had a hard time carrying them home during the 32c heat in Satun province, southern Thailand on January 25.